JP3431466B2 - Semiconductor integrated circuit device for receiver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor integrated circuit device for a receiver, and more particularly to a so-called keyless entry tuner for remotely locking or unlocking a vehicle door lock. Is.

[0002]

2. Description of the Related Art In recent years, particularly in high-end vehicles, so-called keyless entry, which is capable of unlocking or locking the door lock by remote control, is equipped as an electronic door key in automobiles. Have begun.

FIG. 6 shows a schematic configuration of a conventional keyless entry tuner. This tuner 10
0 is transmitted from, for example, a transmitter (not shown) built in the door key to receive antenna 1
An RF (Radio Frequency) amplifier 102 for amplifying a keyless entry transmission signal (hereinafter simply referred to as a keyless transmission signal) received at 01, and a control for keyless entry from an amplified output of the RF amplifier 102. It is configured by a generation circuit 103 that generates a signal (hereinafter, simply referred to as a keyless signal).

On the other hand, in a luxury car equipped with a keyless entry, an FM (Freque) for car audio is usually used.
Equipped with ncy Modulation) / AM (Amplitude Modulation) tuner.

Generally, an FM / AM tuner 200 for car audio uses an RF amplifier 202 for FM broadcasting for high frequency amplification of an FM broadcasting wave received by a receiving antenna 201, as shown in FIG. 20
A reproduction circuit 203 for FM broadcast for reproducing the FM broadcast from the amplified output of 2, and a reproduction output (F
Stereo demodulation circuit 204 for demodulating a stereo broadcast from the M composite signal) and A for high frequency amplification of the AM broadcast wave received by the receiving antenna 201.
It is composed of an RF amplifier 205 for M broadcasting and an AM broadcasting reproducing circuit 206 for reproducing an AM broadcasting from the amplified output of the RF amplifier 205.

In this case, the RF amplifier 20 for FM broadcasting
2. The FM broadcast reproduction circuit 203 and the stereo demodulation circuit 204 constitute an FM tuner unit for car audio. Also, RF amplifier 2 for AM broadcasting
05 and the reproduction circuit 206 for AM broadcasting constitute an AM tuner section for car audio.

The reproduction circuit 203 for FM broadcasting is, for example, a converter composed of a mixing circuit (mixer) for frequency conversion and a local oscillation circuit (VCO), an IF composed of an intermediate frequency amplification circuit and an amplitude limiting circuit. (Intermediate
Frequency) limiter amplifier and FM detection circuit.

The stereo demodulation circuit 204 is constructed, for example, to have a pulse noise reduction circuit and a stereo decoder circuit. The reproduction circuit 206 for AM broadcasting is, for example, a converter including a mixing circuit for performing frequency conversion and a local oscillation circuit,
AGC (Automatic Gain Cons) consisting of an intermediate frequency amplifier circuit
trol) function-equipped IF amplifier and AM detection circuit.

As described above, in the past, the tuner 100 for keyless entry and the FM / AM tuner 200 for car audio were each configured as an independent and independent unit. The reason is that in the case of the tuner 100 for keyless entry, the MW band or V used in the FM / AM tuner 200 for car audio is used.
Reception frequency higher than HF band (about 300MHz-430
This is due to the need for a dedicated network to operate at (MHz).

By the way, the tuner 100 for keyless entry described above is provided with an F
There are a keyless FM tuner that adopts an M type high frequency signal and a keyless AM tuner that uses an AM type high frequency signal.

In the case of a keyless FM tuner, for example, as shown in FIG.
03 is a converter 103 including a mixer 103 ₁ and an oscillation circuit (OSC) 103 ₂ for performing frequency conversion.
a, an IF limiter amplifier 103b including an intermediate frequency amplification circuit and an amplitude limiting circuit, and an FM detection circuit 103c
Is configured.

On the other hand, in the case of a keyless AM tuner, for example, as shown in FIG. 1B, the keyless signal generating circuit 103 performs a frequency conversion by the mixer 103.
₁ and an OSC 103 ₂ , a converter 103a, an IF amplifier 10 with an AGC function, which is an intermediate frequency amplifier circuit
3d and AM detection circuit 103e.

As described above, in the case of a keyless FM tuner, a dedicated IF limiter amplifier 103b is provided before the FM detection circuit 103c, and in the case of a keyless AM tuner, a dedicated AGC function is provided before the AM detection circuit 103e. IF amplifiers 103d are provided respectively.

However, the AM type high frequency signal transmitted from the transmitter as the keyless transmission signal is
Since the transmission rate may be low, the carrier is turned on / off. Therefore, as with the AM tuner unit for car audio described above, an AG for receiving / reproducing an AM high frequency signal with almost no distortion.
C function is not required. Rather, it is more convenient for the gain means to have a limiter amplifier used in the FM tuner unit for car audio in the transmission system.

[0015]

As described above, in the related art, although the equipment for keyless entry to automobiles has begun to spread widely, the tuners for keyless entry and the FM / AM tuners for car audio have been widely used. Since the reception frequencies are different, they are configured as separate units, which results in a large number of parts and an increase in cost resulting from an independent chassis, making it difficult to standardly install them in a general car with a keyless entry. I was supposed to. Therefore, an object of the present invention is to provide a semiconductor integrated circuit device for a receiver, which can reduce the number of parts and can significantly reduce the cost.

[0016]

In order to achieve the above object, a semiconductor integrated circuit device for a receiver of the present invention is an FM
(Frequency Modulation) FM reception for playing broadcast
Playing AM (Amplitude Modulation) broadcasting with a receiver
AM receiver for and a key provided on the FM receiver
FM / AM transmission signal or FM broadcast for re-entry
Limiter for extracting intermediate frequency from high frequency signal
The amplifier unit and the limiter provided in the AM receiver
A for the keyless entry supplied from the amplifier section
For keyless entry by detecting the intermediate frequency of M transmission signal
And an AM detector for generating an AM signal .

Further, the semiconductor integrated circuit device for a receiver of the present invention includes an audio FM tuner for reproducing an FM broadcast wave and an audio AM for reproducing an AM broadcast wave.
A tuner, in the audio FM tuner, limiter amplifier unit which outputs an intermediate frequency FM / AM transmission signal or FM broadcast for keyless entry, and before
A keyless AM that is configured by using the AM detector of the audio AM tuner to which the output signal of the limiter amplifier is supplied and that generates an AM signal for keyless entry for unlocking or locking the door lock of the automobile. And a signal generator.

Furthermore, the semiconductor integrated circuit device for a receiver of the present invention is an audio FM for reproducing FM broadcast waves.
Tuner and audio A for playing AM broadcast waves
M tuner and the audio FM tuner
It is, the high-frequency signal for FM broadcast, or door of the car
A first select section for selecting either the FM / AM transmission signal for keyless entry for unlocking or locking the lock by remote operation, and the FM broadcast selected by the first select section. Of the high frequency signal or the FM / AM transmission signal for keyless entry, and a high frequency signal for the FM broadcast or the frequency converted by the first frequency conversion unit. An IF limiter amplifier unit for amplifying an intermediate frequency corresponding to the FM / AM transmission signal for keyless entry and for keeping the amplitude constant, and the high frequency signal for FM broadcasting output from the IF limiter amplifier unit. And an output signal corresponding to the output signal corresponding to the FM transmission signal for keyless entry.
Provided in the M detector and the audio AM tuner,
A second frequency conversion unit for frequency-converting a high frequency signal for AM broadcasting, and an amplifier for amplifying an intermediate frequency corresponding to the high frequency signal for AM broadcasting, which has been frequency-converted by the second frequency conversion unit. It corresponds to an IF amplifier section and an output signal output from the IF amplifier section corresponding to the high frequency signal for AM broadcasting, or an AM transmission signal for the keyless entry output from the IF limiter amplifier section. A second select section for selecting one of the output signals and the A selected by the second select section.
It is provided with an output signal corresponding to a high frequency signal for M broadcasting and an AM detection unit for performing AM detection of the output signal corresponding to the AM transmission signal for keyless entry .

According to the semiconductor integrated circuit device for a receiver of the present invention, an AM tuner for keyless entry can be integrated with, for example, an FM receiver. This makes it possible to share some of the components and the chassis.

In particular, when integrated with the FM / AM receiver, the tuner for keyless entry can be constructed without being influenced by the modulation method of the transmitter, and the design can be rationalized.

Further, the FM broadcast wave in the VHF band is received,
The frequency characteristics of the current glass antenna are the UHF of about 430 MHz used in the tuner for keyless entry.
By extending to the band, the receiving antenna and the transmission cable can be shared, and the cost and weight can be further reduced.

In short, when equipped in a car, an IC (Integrated Circui) of a tuner for keyless entry and an FM / AM tuner for audio is used.
Not only the cost can be reduced by adopting t) as a single chip, but also the reduction in weight can improve the deterioration of fuel consumption and emission.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a semiconductor integrated circuit device for a receiver according to an embodiment of the present invention.
The case where the present invention is applied to an FM / AM tuner for car audio is shown as an example.

This FM / AM tuner IC 10 for car audio includes, for example, a selector 11 as a first selecting section and a converter 1 as a first frequency converting section.
2. IF limiter amplifier 13 as an IF limiter amplifier unit, FM detector circuit 14 as an FM detector unit, stereo demodulator circuit 15 as a stereo demodulator unit, converter 16 as a second frequency converter unit, and A as an IF amplifier unit.
An IF amplifier 17 with a GC function, a selector 18 as a second select section, and an AM detection circuit 19 as an AM detection section are integrated on one chip.

The selector 11 is, for example, a high frequency signal for FM broadcasting which is received by a receiving antenna 21a composed of a glass antenna and is high frequency amplified by an RF amplifier 22 for FM broadcasting, or the receiving antenna 21.
The F for keyless entry for remotely unlocking or locking the door lock of the vehicle, which is received at b and is high-frequency amplified by the RF amplifier for keyless 24.
M / AM transmission signal (hereinafter simply referred to as keyless FM / AM transmission signal) FM1 / AM1 is selected,
The output is provided to the converter 12 in the subsequent stage.

The converter 12 is for converting the frequency of the high frequency signal for FM broadcasting or the keyless FM / AM transmission signal FM1 / AM1 selected by the selector 11, and for example, the mixer 12a, the V for FM broadcasting.
It is configured to have a CO 12b, a keyless OSC 12c, and a selector 12d (third select unit) that selects either the output of the FM broadcast VCO 12b or the output of the keyless OSC 12c.

The keyless OSC 12c is
The keyless FM / AM transmission signals FM1 / AM1 can be shared by matching the frequencies of the carriers. The IF limiter amplifier 13 amplifies the output (intermediate frequency) frequency-converted by the converter 12 and makes the amplitude constant, and is composed of an intermediate frequency amplifier circuit and an amplitude limiting circuit.

The FM detection circuit 14 FM-detects the output signal corresponding to the high frequency signal for FM broadcasting and the output signal FM2 corresponding to the keyless FM transmission signal FM1 among the signals output from the IF limiter amplifier 13. Then F
The M composite signal or the FM signal for keyless entry (hereinafter, simply referred to as a keyless FM signal) FM3 for unlocking or locking the door lock of the automobile is output.

The stereo demodulation circuit 15 demodulates the detection output (FM composite signal) corresponding to the high frequency signal for FM broadcasting, which is output from the FM detection circuit 14, and demodulates the FM radio L signal and FM as stereo sound output. Radio R
It is designed to output signals and.

The converter 16 includes the receiving antenna 21.
a for converting the high frequency signal for AM broadcasting which is received by a and is high frequency amplified by the RF amplifier 23 for AM broadcasting. The mixer 16a and the VCO 16 for AM broadcasting are used.
and b.

The IF amplifier 17 is for amplifying the output (intermediate frequency) whose frequency has been converted by the converter 16, and is composed of an intermediate frequency amplifier circuit and an AGC circuit.

The selector 18 outputs an output signal corresponding to the high frequency signal for AM broadcasting output from the IF amplifier 17, or an output signal corresponding to the keyless AM transmission signal AM1 output from the IF limiter amplifier 13. A
One of M2 is selected and output to the AM detection circuit 19 in the subsequent stage.

The AM detection circuit 19 AM-detects the output signal corresponding to the high-frequency signal for AM broadcasting and the output signal AM2 corresponding to the keyless AM transmission signal AM1 selected by the selector 18, and AM-detects the AM radio signal. Alternatively, an AM signal for keyless entry (hereinafter simply referred to as a keyless AM signal) AM3 is output.

In this case, the RF amplifier 22 for FM broadcasting,
The converter 12, the IF limiter amplifier 13, the FM detection circuit 14, and the stereo demodulation circuit 15 provide an in-vehicle audio FM tuner unit (FM receiver), an AM broadcast RF amplifier 23, a converter 16, I.
The F-amplifier 17 and the AM detection circuit 19 respectively configure a vehicle-mounted audio AM tuner unit (AM receiver).

Further, the keyless RF amplifier 24, the converter 12, the IF limiter amplifier 13, and the AM detection circuit 19 constitute an AM tuner for keyless entry (keyless AM signal generator).

Further, a keyless RF amplifier 24, converter 12, IF limiter amplifier 13, and FM.
The detection circuit 14 constitutes an FM tuner for keyless entry (keyless FM signal generator).

As described above, by integrating the tuner for keyless entry with the FM / AM tuner for car audio, it is possible to integrate the IC into one chip.
Moreover, the IF limiter amplifier 13 of the FM tuner for car audio and the A of the AM tuner for car audio are used.
Since the AM tuner for the keyless entry is configured to be used also as the M detection circuit 19, it is possible to reduce the number of parts as well as the number of parts is reduced, and the cost can be significantly reduced.

Further, not only the AM tuner for keyless entry but also the FM tuner for keyless entry can be used, for example,
A tuner for keyless entry can be reasonably configured, which is not affected by the modulation method of the transmitter (not shown) built into the door key.

FIG. 2 shows the FM for the car audio mentioned above.
1 specifically shows a configuration example of a selector 11 and a converter 12 in an / AM tuner IC 10. For example, when the current source 31a is turned on (set to H level) under the control of the external controller 26, the high frequency amplified high frequency signal for FM broadcasting (one input) is a two input signal by the differential pair 32a. (In-phase and anti-phase signals)
And is supplied to the multiplier 33.

At the same time, by turning on the current source 31b, a signal of one input supplied from the FM broadcasting VCO 12b through the capacitor 34a is supplied to the differential pair 32b.
Are converted into two-input signals (in-phase and anti-phase signals) and supplied to the multiplier 33.

Thus, the multiplier 33 is configured to generate the intermediate frequency signal for FM broadcasting as the frequency conversion output by obtaining the difference between the signals of the respective phases.

On the other hand, for example, the external controller 26
When the current source 31c is turned on by the control from, the high frequency amplified keyless FM / AM transmission signal FM1 / AM
1 (one input) is converted into a two-input signal (in-phase and anti-phase signals) by the differential pair 32c and supplied to the multiplier 33.

At the same time, when the current source 31d is turned on, the signal of one input supplied from the keyless OSC 12c via the capacitor 34b is supplied to the differential pair 32d.
Are converted into two-input signals (in-phase and anti-phase signals) and supplied to the multiplier 33.

As a result, the multiplier 33 is configured to generate the intermediate frequency signal of the keyless FM / AM transmission signal FM1 / AM1 as the frequency conversion output by obtaining the difference between the signals of the respective phases. There is.

In this case, the controller 26 sets the current sources 31a and 31b to the high level (H) in response to the turning on of the FM / AM tuner switch for car audio, and otherwise, the current source 31c. , 31d are set to a high level (H).

Each differential pair 32a, 32b, 32c, 32d
Is configured such that the emitters of the two NPN transistors Tr1 and Tr2 are commonly connected, their bases are connected to each other via a resistor r, and each collector is connected to a multiplier 33. There is. The emitters of the NPN transistors Tr1 and Tr2, which are connected in common, have current sources 31a, 31b and 31 respectively.
It is grounded via c and 31d.

A reference voltage is supplied from the voltage source 35a to each base of the NPN transistor Tr2 of the differential pair 32a and 32c, and a voltage source 35b is supplied to each base of the NPN transistor Tr1 of the differential pair 32b and 32d. The reference voltage is supplied from each.

Further, in the differential pair 32b, 32d,
The power supply voltage + B is supplied to the collectors of the NPN transistors Tr1 and Tr2 via load resistors 36a and 36b, respectively.

That is, FM / AM for car audio
When the tuner switch is not turned on, the RF signal is received by the reception antenna 21b and the RF amplifier 2 for keyless is used.
4, any one of the keyless FM / AF transmission signals FM1 / AM1 that has been high-frequency amplified by 4 is selected, converted into an intermediate frequency signal, and output.

When the FM / AM tuner switch for car audio is turned on, the high frequency signal for FM broadcasting, which is received by the receiving antenna 21a and is high frequency amplified by the RF amplifier 22 for FM broadcasting, is selected, It is designed to be converted into an intermediate frequency signal and output.

FIG. 3 shows the FM for car audio described above.
2 specifically shows a configuration example of the selector 18 in the / AM tuner IC 10. The selector 18 is mainly composed of, for example, a differential pair 42a provided in the IF limiter amplifier 13 via a capacitor 41a and a differential pair 42b provided in the IF amplifier 17 via a capacitor 41b. .

Each differential pair 42a, 42b has two NPNs.
The emitters of the type transistors Tr1 and Tr2 are commonly connected, and the bases thereof are connected to each other via a resistor r,
Further, each of the collectors is connected to the AM detection circuit 19. In addition, each differential pair 42a,
42b, NPN type transistors Tr1 and Tr
The power supply voltage + B is supplied to the collector of 2 through the load resistors 43a and 43b, respectively.

The commonly connected emitters of the NPN transistors Tr1 and Tr2 are grounded via the current sources 44a and 44b, respectively. Each of the current sources 44a and 44b is selectively controlled by the external controller 26.

Further, the NPN of the differential pair 42a, 42b is
A reference voltage is supplied from the voltage source 45 to each base of the type transistor Tr2. According to the selector 18 having such a configuration, the controller 2
By the control from 6, for example, when the current source 44a is turned on (set to H level), the FM detection circuit 14 is turned off and the output corresponding to the keyless AM transmission signal AM1 output from the IF limiter amplifier 13 is output. The signal AM2 (one input) is converted into a two-input signal (in-phase and anti-phase signals) by the differential pair 42a and output to the AM detection circuit 19.

On the other hand, under the control of the controller 26, for example, the current source 44b is turned on (set to H level).
Then, the output signal (one input) corresponding to the high frequency signal for AM broadcasting output from the IF amplifier 17 is output to the differential pair 4
It is converted into a two-input signal (in-phase and anti-phase signal) by 2b and output to the AM detection circuit 19.

That is, when the switch of the FM / AM tuner for car audio is not turned on, the selector 18 receives the keyless AF signal which is received by the receiving antenna 21b and is high-frequency amplified by the RF amplifier 24 for keyless. It is designed to select signals.

When the FM / AM tuner switch for car audio is turned on, the high frequency signal for AM broadcasting, which is received by the receiving antenna 21a and is high frequency amplified by the RF amplifier 23 for AM broadcasting, is selected. It has become.

Next, the above-mentioned car audio FM /
A method of generating a keyless FM / AM signal in the AM tuner IC 10 will be described. FIG. 4 shows a signal waveform of a keyless FM signal when the FM / AM tuner IC 10 for car audio is operated as an FM tuner for keyless entry.

For example, it is assumed that the keyless FM transmission signal FM1 transmitted from the transmitter incorporated in the door key for remotely unlocking or locking the door lock of the automobile is received by the receiving antenna 21b. (Refer to the same figure (a)).

Then, the keyless FM transmission signal FM1
Is high-frequency amplified by the keyless RF amplifier 24, selected by the selector 11, and converted to an intermediate frequency signal by the converter 12.

Then, this intermediate frequency is amplified by the IF limiter amplifier 13 and the amplitude thereof is limited, so that it becomes the output signal FM2 (see FIG. 9B). After this, the output signal FM2 is sent to the FM detection circuit 14 where it is FM detected. This allows the keyless FM signal FM to unlock or lock the door lock.
3 is generated (see FIG. 7C).

FIG. 5 shows the FM / A for the car audio.
6 shows a signal waveform of a keyless AM signal when the M tuner IC 10 is operated as an AM tuner for keyless entry.

For example, it is assumed that the keyless AM transmission signal AM1 transmitted from the transmitter incorporated in the door key for remotely unlocking or locking the door lock of the automobile is received by the receiving antenna 21b. (Refer to the same figure (a)).

Then, the keyless AM transmission signal AM1
Is high-frequency amplified by the keyless RF amplifier 24, selected by the selector 11, and converted to an intermediate frequency signal by the converter 12.

Then, the intermediate frequency is amplified by the IF limiter amplifier 13 and the amplitude thereof is limited, so that it becomes the output signal AM2 (see FIG. 9B). After that, the output signal AM2 is sent to the AM detection circuit 19 via the selector 18 and is AM-detected there. This allows you to unlock or lock the door lock,
A keyless AM signal AM3 is generated (see (c) in the figure).

As described above, the AM / FM tuner for keyless entry is replaced with the FM / AM tuner for car audio.
It is designed to be integrated with the tuner. That is, I
For C, FM / AM tuner for car audio and A for keyless entry are added by adding a little circuit.
It is designed so that it can also be used as an M / FM tuner.
This makes it possible to share some of the components and the chassis. Moreover, the IF limiter amplifier of FM tuner for car audio is used for AM for keyless entry.
It is used as a gain means of a transmission system in a tuner. Therefore, it is possible to realize an AM tuner for keyless entry with high gain (convenient as a gain means) as well as cost reduction and weight reduction by reducing the number of parts.

FM / AM for keyless entry
Since the tuner is integrated with the FM / AM tuner for car audio, the tuner can be configured without being influenced by the modulation method of the transmitter, and the design can be rationalized.

In the above-described embodiment of the present invention, the case where the door lock of the automobile is unlocked or locked by remote control has been described as an example, but the invention is not limited to this. For example, a door of a house or a garage. It can also be applied when unlocking or locking the shutter, etc.

FM / AM for keyless entry
The receiving antenna for receiving the transmission signal is FM / AM
The present invention is not limited to the case where it is provided separately from the receiving antenna for receiving the broadcast wave, but for example, FM in the VHF band.
Use the frequency characteristics of the current glass antenna that receives broadcast waves in a tuner for keyless entry 430
By extending to the UHF band of about MHz, the receiving antenna and the transmission cable may be shared.
In this case, further cost reduction and weight reduction can be achieved, and deterioration of fuel consumption of vehicles and deterioration of emissions can be improved.

The present invention can be applied not only to the FM / AM tuner for car audio but also to various FM / AM receivers. Of course, various modifications can be made without departing from the scope of the invention.

[0071]

As described above in detail, according to the present invention, it is possible to provide a semiconductor integrated circuit device for a receiver which can reduce the number of parts and can significantly reduce the cost.

[Brief description of drawings]

FIG. 1 shows a configuration of a semiconductor integrated circuit device for a receiver according to an embodiment of the present invention, in which an FM / A for car audio is used.
The schematic diagram showing the example applied to the M tuner.

FIG. 2 is a schematic diagram showing a more specific configuration of a main part of an FM / AM tuner for car audio.

FIG. 3 is a schematic diagram showing the configuration of still another main part of the FM / AM tuner for car audio in a more specific manner.

FIG. 4 is a signal waveform diagram showing an example of a case where an FM / AM tuner for car audio is also operated as an FM tuner for keyless entry.

FIG. 5 is a signal waveform diagram showing an example in which an FM / AM tuner for car audio is also operated as an AM tuner for keyless entry.

FIG. 6 is a schematic diagram showing the configuration of a keyless entry tuner for explaining the related art and its problems.

FIG. 7 is a schematic diagram showing a configuration of an FM / AM tuner for car audio.

FIG. 8 is a schematic diagram showing the configuration of a keyless entry tuner in more detail.

[Explanation of symbols]

10 ... FM / AM tuner IC for car audio 11 ... Selector 12 ... Converter 12a ... Mixer 12b ... VCO 12c for FM broadcasting ... OSC 12d for keyless ... Selector 13 ... IF limiter amplifier 14 ... FM detection circuit 15 ... Stereo demodulation Circuit 16 ... Converter 16a ... Mixer 16b ... VCO for AM broadcast 17 ... IF amplifier 18 with AGC function ... Selector 19 ... AM detection circuit 21a ... Receiving antenna (for FM / AM broadcast wave) 21b ... Receiving antenna (keyless FM / AF transmission signal) 22 ... FM broadcast RF amplifier 23 ... AM broadcast RF amplifier 24 ... Keyless RF amplifier 26 ... Controllers 31a, 31b, 31c, 31d ... Current sources 32a, 32b, 32c, 32d ... Difference Moving pair 33 ... Multipliers 34a, 34b ... Capacitors 35a, 35 ... voltage source 36a, 36b ... load resistor 41a, 41b ... capacitors 42a, 42b ... differential pair 43a, 43 b ... load resistor 44a, 44b ... current source 45 ... voltage source Tr1, Tr2 ... NPN transistor r ... resistance

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B 1/06-1/30 B60J 5/00 E05B 49/00 E05B 65/20

Claims (29)

(57) [Claims] 1. FM (Frequency Modulation) broadcasting is re-established.
FM receiver for live broadcasting and A for playing AM (Amplitude Modulation) broadcasting
M receiver and F for keyless entry provided in the FM receiver
Medium from M / AM transmission signal or high frequency signal for FM broadcasting
A limiter amplifier unit for extracting inter-frequency signals and the AM receiver, which is provided in the AM receiver,
Of the supplied AM transmission signal for the keyless entry
Detects intermediate frequency and generates AM signal for keyless entry
A semiconductor integrated circuit device for a receiver , comprising: 2. The limiter amplifier unit is an intermediate frequency amplifier.
2. The semiconductor integrated circuit device for a receiver according to claim 1, wherein the semiconductor integrated circuit device comprises a circuit and an amplitude limiting circuit . 3. The output signal of the limiter amplifier section is detected.
FM detection to generate an FM signal for keyless entry
3. The semiconductor integrated circuit device for receiver according to claim 2, further comprising a section. Wherein said FM receiver, a semiconductor integrated circuit device receiver according to claim 1, characterized in that the audio FM tuner for vehicle. 5. The keyless entry FM signal comprises:
The semiconductor integrated circuit device for a receiver according to claim 3, which is for unlocking or locking a door lock of an automobile. 6. The semiconductor integrated circuit device for a receiver according to claim 1, wherein the AM detection unit is an AM detection circuit of an AM receiver. 7. The semiconductor integrated circuit device for a receiver according to claim 6, wherein the AM receiver is an on-vehicle audio AM tuner. 8. The AM signal for keyless entry comprises:
The semiconductor integrated circuit device for a receiver according to claim 1, which is for unlocking or locking a door lock of an automobile. 9. An audio FM tuner for reproducing an FM broadcast wave, an audio AM tuner for reproducing an AM broadcast wave, and an FM / AM transmission signal for keyless entry or an FM broadcast in the audio FM tuner. limiter amplifier unit for outputting the intermediate frequency, and the Rimittaa
Keyless AM signal generation for generating an AM signal for keyless entry for unlocking or locking a door lock of an automobile, which is configured by using the AM detection unit of the audio AM tuner to which the output signal of the pump unit is supplied. And a semiconductor integrated circuit device for a receiver. 10. constructed using a limiter amplifier portion and the FM detection portion before Symbol audio FM tuner, for unlocking or locking the door locks of a motor vehicle, keyless FM signal to produce a FM signal for keyless entry The semiconductor integrated circuit device for a receiver according to claim 9, further comprising a generation unit. 11. The audio FM tuner is an FM (RF) for radio broadcasting for amplifying the FM broadcast wave.
and Equency) part, for a door lock of vehicles unlocking or locking by remote control, keyless RF unit for amplifying an FM / AM transmission signal for key-less entry
And one of the RF section for FM broadcasting and the RF section for keyless
10. A selector for selecting is provided.
A semiconductor integrated circuit device for a receiver as set forth in. 12. The audio AM tuner, a semiconductor integrated circuit device receiver of claim 9, wherein <br/> to have AM broadcast RF unit for amplifying the AM broadcast wave. 13. The RF unit for FM broadcasting, the AM broadcasting
Use RF unit, and the RF unit for keyless respectively, the semiconductor integrated circuit device receiver according to claim 11 and claim 12, characterized in that it is composed of a receiving antenna and RF amplifier . 14. At least, a semiconductor integrated circuit device receiver of claim 13, the receiving antenna of the receiving antenna and the AM broadcast RF portion of the FM broadcast RF unit is characterized in that it is shared. 15. The RF section for FM broadcasting and the AM
Receiving antenna of the broadcast RF unit is constituted by the glass antenna, a semiconductor integrated circuit device receiver of claim 13, characterized in that it is shared with the receiving antenna of the keyless RF unit. 16. An audio system for reproducing FM broadcast waves
FM tuner and audio AM tuner for playing AM broadcast waves
And a high-frequency signal for FM broadcasting provided in the audio FM tuner , or an FM / AM transmission signal for keyless entry for remotely unlocking or locking a car door lock. And a high frequency signal for the FM broadcast or the FM for the keyless entry selected by the first select unit.
/ AM a first frequency converter for frequency-converting a transmission signal, and the FM frequency-converted by the first frequency converter
An IF limiter amplifier section for amplifying an intermediate frequency corresponding to the high frequency signal for broadcasting or the FM / AM transmission signal for keyless entry and for keeping the amplitude constant, and output from this IF limiter amplifier section, An FM detection unit for FM detecting an output signal corresponding to the high frequency signal for FM broadcasting and an output signal corresponding to the FM transmission signal for keyless entry, and a high frequency for AM broadcasting provided in the audio AM tuner. A second frequency conversion unit for frequency-converting the signal, and the AM frequency-converted by the second frequency conversion unit
An IF amplifier unit for amplifying an intermediate frequency corresponding to a high frequency signal for broadcasting, and an output signal corresponding to the high frequency signal for AM broadcasting output from the IF amplifier unit, or from the IF limiter amplifier unit. Corresponding to a second select section for selecting one of the output signals corresponding to the AM transmission signal for the keyless entry, and the high frequency signal for AM broadcast selected by the second select section. And an AM detection unit for performing AM detection of the output signal corresponding to the AM transmission signal for keyless entry, the semiconductor integrated circuit device for a receiver. 17. The first frequency converter is a mixing circuit, VCO (Voltage Controlled Oscilla) for FM broadcasting.
tor), a keyless entry OSC, and a third select unit for selecting either the output of the FM broadcast VCO or the output of the keyless entry OSC. Claim 1
7. A semiconductor integrated circuit device for a receiver according to item 6. 18. The semiconductor integrated circuit device for a receiver according to claim 16, wherein the second frequency conversion unit is configured to have a mixing circuit and a VCO for AM broadcasting. 19. The post-stage of the FM detector further comprises:
17. The semiconductor integrated circuit device for a receiver according to claim 16, further comprising a stereo demodulation unit for demodulating a detection output corresponding to the high frequency signal for FM broadcasting output from the FM detection unit. . 20. The IF amplifier unit comprises an AGC (Automa)
17. The semiconductor integrated circuit device for a receiver according to claim 16, which has a tic gain control) function. 21. The FM is provided in the first select section.
RF for FM broadcasting for amplifying high frequency signals for broadcasting
17. The semiconductor integrated circuit device for a receiver according to claim 16, wherein a unit and a RF unit for keyless for amplifying the FM / AM transmission signal for keyless entry are respectively connected. 22. The second frequency converter includes the A
RF for AM broadcasting to amplify high frequency signals for M broadcasting
17. The semiconductor integrated circuit device for a receiver according to claim 16, wherein the parts are connected. 23. The RF section for FM broadcasting, the AM broadcasting
Use RF unit, and the RF unit for keyless respectively, the semiconductor integrated circuit device receiver according to any one of claims 21 or 22, characterized in that it is composed of a receiving antenna and RF amplifier. 24. At least, a semiconductor integrated circuit device receiver of claim 23, the receiving antenna of the receiving antenna and the AM broadcast RF portion of the FM broadcast RF unit is characterized in that it is shared. 25. The RF section for FM broadcasting and the AM
Receiving antenna of the broadcast RF unit is constituted by the glass antenna, a semiconductor integrated circuit device for receiver of claim 23, characterized in that it is shared with the receiving antenna of the keyless RF unit. 26. The first, second and third select sections
Is the audio FM tuner and the audio
Characterized by being controlled according to the switch of the AM tuner
The receiver according to claim 16 or 17.
Semiconductor integrated circuit device. 27. The first select section is the audio
Of the FM FM tuner and the audio AM tuner
Keyless entry if the switch is not turned on
A contract characterized by selecting an FM / AM transmission signal for
17. A semiconductor integrated circuit device for a receiver according to claim 16. 28. The second select section is provided with the audio device.
Of the FM FM tuner and the audio AM tuner
Keyless entry if the switch is not turned on
2. An AM transmission signal for use in selecting a signal.
7. A semiconductor integrated circuit device for a receiver according to item 6. 29. The third select section is the audio
Of the FM FM tuner and the audio AM tuner
If the switch is not turned on, the keyless
The output of the OSC for the memory is selected.
Item 17. A semiconductor integrated circuit device for a receiver according to Item 17.