JPH03933B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a wireless communication device equipped with a power amplifying device for connecting to the main body of a portable wireless communication device to amplify the transmission output, and particularly relates to the wireless communication device. Concerning transmission output control methods.

(Prior Art) In general, portable wireless communication devices have limited transmission output power to about several hundred milliwatts to several watts due to limitations on battery capacity and heat dissipation structure. The output power of such a device is a small value compared to the output power of a vehicle-mounted wireless communication device or a fixed wireless communication device. Therefore, if it is desired to obtain larger transmission output power, a power amplification device that is connected to a portable wireless communication device and includes a power amplification circuit for amplifying the output power to be transmitted is required.

The configuration of a conventional wireless communication device in such a case and its drawbacks will be explained with reference to FIGS. 1 to 3. In FIGS. 1 to 3, 1 is a portable wireless communication device, and 2 is a power amplification device equipped with a power amplification circuit for amplifying its transmission output power. Here, parts not related to the present invention, such as a receiver section, a control section, an antenna, and an antenna cooperator, are omitted.

Generally, a transmitter of a wireless communication device is equipped with an automatic output power control circuit so that its output power remains constant even with changes in signal frequency, power supply voltage, ambient temperature, and the like. In the wireless communication device shown in FIG. 1, the portable wireless communication device 1 is naturally equipped with an automatic output power control circuit in case it is carried and used alone. Further, even when the portable radio communication device 1 and the power amplification device 2 are connected and used, it is necessary to control the output power to be transmitted for the same reason as above. Therefore, in the conventional method, the power amplifier device 2 was also equipped with a similar power amplifier circuit. Here, 3 and 4 in FIG. 1 are the first and second power amplifier circuits, 5 and 6 are the first and second output power detection circuits, and 7 and 8 are the first and second output power detection circuits.
, 9 and 10 are first and second reference voltage input terminals, and 12 and 13 are input and output terminals of the power amplifier 2, respectively. Since the operation of the automatic output power control circuit is well known, the explanation thereof will be omitted here.

In the configuration of a conventional wireless communication device as shown in FIG. 1, there is a big problem in the heat dissipation design of the portable wireless communication device 1. FIGS. 2 and 3 show a portable radio communication device 1 and a second power amplification circuit 4 for connecting the portable radio communication device and amplifying transmission output power.
1 is a diagram illustrating an example of the appearance of a wireless communication device including a power amplifying device 2 equipped with the following. Portable wireless communication device 1
The method of attaching the
There are various types other than those shown in the figure, but in any case, most or all of the portable wireless communication device 1 is housed in the power amplifier 2, taking into consideration appearance, ease of use, volume, vibration resistance, etc. It is common to take Originally, the portable wireless communication device 1 was designed to be used in free air, and did not have a sufficient heat dissipation structure in terms of appearance, weight, etc. Therefore, if the portable radio communication device 1 is housed in a storage form such as the examples shown in FIGS. 2 and 3, air circulation around the portable radio communication device 1 is poor, and the heat dissipation effect is greatly impaired. However, in the conventional method as shown in FIG.
When used in connection with the portable wireless communication device 1, the output power of the portable wireless communication device 1 is maintained at several hundred mW to several W, which is the same as the transmission output power when used alone, and generates the same amount of heat. Therefore, when the portable radio communication device 1 and the power amplifier 2 are connected and used, the temperature rise of the portable radio communication device 1 far exceeds the design value when used alone, so the portable radio communication This not only adversely affects the characteristics of various circuits included in the device 1, but also has the possibility of deteriorating the reliability of the device, which is a problem in ensuring reliability.

(Object of the Invention) An object of the present invention is to provide an output power detection circuit not only inside a portable radio communication device but also inside a power amplifier device connected to the portable radio communication device to increase transmission output power. AGC obtained by
The structure is configured such that the above-mentioned drawbacks can be eliminated and temperature rise can be avoided by detecting the difference between the voltage and the reference voltage under integrated control and controlling the transmission output power of the portable wireless communication device. The objective is to provide a wireless communication device with

(Structure of the Invention) A wireless communication device according to the present invention includes a portable wireless communication device and a power amplification device.

The portable wireless communication device includes a first power amplifier circuit, a first output power detection circuit, a differential amplifier circuit, and a switch.

The first power amplifier circuit has an AGC terminal, and the AGC terminal has an AGC terminal.
It is used to amplify high frequency power as well as to provide functions.

The first output power detection circuit is for detecting the first output power of the first power amplifier circuit and for transmitting the first output power to the outside.

A differential amplifier circuit is designed to send out a voltage proportional to the difference between the AGC voltage and the reference voltage to the AGC terminal by applying the AGC voltage to the positive input terminal and the reference voltage to the reverse polarity input terminal. be.

The switch is for selecting either the AGC output voltage of the first output power detection circuit or the AGC output voltage of the power amplifier.

On the other hand, the power amplifier device includes a second power amplifier circuit,
This configuration includes a second output power detection circuit.

The second power amplification circuit inputs the first output power sent out from the first output power detection circuit included in the portable wireless communication device, and amplifies the power again to obtain the second output power. It is something.

The second output power detection circuit is for detecting the second output power of the second power amplifier circuit and for transmitting the second output power to the outside.

(Example) Next, the present invention will be described in detail with reference to the drawings.

FIG. 4 is a block diagram showing a first embodiment of a wireless communication device according to the present invention. In Figure 4,
Numbers 1 to 7, 9, 12, and 13 represent the same elements as in FIG.

Next, FIG. 4 will be compared with FIG. 1 to clarify the differences in operation. In FIG. 1, power amplification circuits 3 and 4 of a portable radio communication device 1 and a power amplification device 2 are each independently provided with an automatic control function. For this reason, the first power amplifier circuit 3 of the portable wireless communication device 1 consumes the same amount of power when both of the above devices are connected as when used alone, which may cause heat dissipation problems. This causes temperature rise.
On the other hand, in the configuration shown in FIG. 4, the power amplifier 2 does not have an automatic control function that operates independently. When the portable radio communication device 1 and the power amplifier device 2 are connected, the AGC voltage obtained by the second power detection circuit 6 is input to the first differential amplifier circuit 7 provided in the portable radio communication device 1. Then, an automatic control loop spanning the portable wireless communication device 1 and the power amplifier device 2 is formed. In this case, the detection signal from the first power amplifier circuit 5 is transmitted to the switching switch 11.
It can be switched by The switching switch 11 may be switched manually, or may be switched automatically after detecting that the power amplifier 2 is connected by a mechanical or electronic method. Now, if the gain of the second power amplifier circuit 4 is sufficiently large, the power applied to the input terminal 12, that is, the output power of the portable radio communication device 1, is a relatively small value.
For example, in order to obtain 10W at the output terminal 13 of the power amplifier 2, the gain of the second power amplifier circuit 4 is
Assuming 30 dB, terminal 12 requires an input power of 10 mW. As described above, the portable wireless communication device 1 has the ability to output an output of several hundred mW to several W for mere use. Therefore, in the configuration of FIG. 1, the gain of the second power amplifier circuit 4 may be further reduced, or an appropriate attenuator may be inserted between the first and second power amplifier circuits 3 and 4. There must be. On the other hand, in the configuration shown in FIG. 4, the output power of the input terminal 12 is
An automatic control loop operates to reduce the gain of the first power amplifier circuit 3 until it reaches 10 mW. Therefore, the power consumption of the first power amplifier circuit 3 becomes the minimum necessary value.

In FIG. 4, only the feedback input of the differential amplifier circuit 7 is switched by the switch 11. However, if there is no special relationship in the conversion characteristics from high frequency power to DC voltage in the first or second voltage detection circuits 5 and 6,
It is also necessary to change the voltage at the reference voltage input terminal 9. For example, there is a method in which a D/A conversion signal from a control section is applied to the reference voltage input terminal 9 to achieve the above function, or a method in which a second switch is used in addition to the switching switch 11 as in the fifth embodiment. switch 14 for switching
A method of providing different reference voltages to the differential amplifier circuit 7 can be considered. Here, 1 to 7,
Numbers 9, 11, 13, etc. indicate the same elements as in FIG. 4, except that 14 is a second switching switch, 15 and 16 are first and second reference voltage generation circuits, and 18 is a variable It is a gain amplification circuit.
The second changeover switch 14 can of course be implemented either as a mechanical switch or as an electronic switch.

In addition to the method of the second embodiment shown in FIG. 5, the method of the third embodiment shown in FIG. A voltage adjustment circuit 17 is inserted between the converter circuits 19 and 19.
or the method of feeding back to the first power amplification circuit 3 via the first or second power detection circuit 5,6.
Another possible method is to change the amount of AGC output binding. Furthermore, it may be effective to combine two or more of these methods. In any case, the most suitable method should be selected, taking into consideration economic efficiency, circuit scale, and further consideration of equipment operation and support for step-by-step transmission output power control. In addition, in the discussion so far, for convenience, it has been said that
Although the first power amplifier circuit has been described as being controlled, there are various methods for controlling the gain of the power amplifier circuit. There is also a method of providing a variable attenuation circuit in front of the first power amplifier circuit and controlling it based on the same idea as the variable gain amplifier circuit in the second embodiment shown in FIG.

On the other hand, the first power amplifier circuit 3 and the differential amplifier circuit 7
In order to control this, a conversion circuit 19 may be inserted as shown in FIG. 6 to convert the type and magnitude of the signal to be handled. In any case,
If a configuration is adopted in which the transmission output power of the first portable radio communication device 1 is controlled by the differential amplifier circuit 7, the intended function can be sufficiently achieved.

(Effects of the Invention) As explained above, the present invention provides an output power detection circuit not only inside a mobile radio communication device but also inside a power amplifier installed in the mobile radio communication device to increase transmission output power. The difference between the resulting AGC voltage and the reference voltage is detected under integrated control, and the transmission output power of the mobile wireless communication device is controlled to prevent excessive heat generation. In addition, it has the effect of being highly reliable and economical.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of a wireless communication device according to the prior art. Figures 2 and 3
1 is a perspective view showing an example of a mounting structure of the wireless communication device shown in FIG. 1. FIG. FIGS. 4 to 6 are block diagrams each showing an embodiment of a wireless communication device constructed according to the present invention. DESCRIPTION OF SYMBOLS 1... Portable wireless communication device, 2... Power amplifier device, 3, 4... Power amplifier circuit, 5, 6... Output power detection circuit, 7, 8... Differential amplifier circuit, 9, 1
0, 12, 13... terminal, 11, 14... switch, 15, 16... reference voltage generation circuit, 17...
DC detection voltage adjustment circuit, 18... variable gain amplifier circuit, 19... conversion circuit.

Claims (1)

[Claims] 1 A radio communication device consisting of a portable radio communication device and a power amplification device, wherein the portable radio communication device is
a first power amplification circuit having an AGC terminal and having an AGC function and for amplifying high frequency power;
a first output power detection circuit for detecting a first output power of the first power amplifier circuit and for sending the first output power to the outside; a differential amplifier circuit for sending out a voltage proportional to the difference between the AGC voltage and the reference voltage to the AGC terminal by applying a reference voltage to the polarity input terminal;
AGC output voltage of the output power detection circuit, or
a switch for selecting one of the AGC output voltages of the power amplification device, and the power amplification device is outputted from the first output power detection circuit including the portable wireless communication device. The first output power is input and the power is amplified again, and the second output power is amplified again.
a second power amplifier circuit for obtaining an output power of
It is configured to include a second output power detection circuit for detecting the second output power of the second power amplifier circuit and for transmitting the second output power to the outside. Featured wireless communication equipment.