JP4073532B2 - Frequency variable filter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a variable frequency filter device used in a transceiver for frequency hopping communication, and more particularly to a variable frequency filter device that can reduce power consumption.
[0002]
[Prior art]
A conventional frequency variable filter device will be described with reference to FIG. FIG. 5 is a block diagram showing the configuration of a conventional variable frequency filter device.
As shown in FIG. 5, the conventional variable frequency filter device mainly includes a first filter selector 1, a plurality of frequency variable filters 2, a second filter selector 3, and a control unit 4.
In FIG. 5, the number of frequency variable filters 2 is four.
[0003]
As shown in FIG. 6, the control unit 4 includes an on / off pattern generation circuit 41, a filter selection circuit 42, and a plurality of bias generation circuits 43 provided corresponding to the frequency variable filter 2. ing. FIG. 6 is a configuration block diagram of the control unit 4.
[0004]
Hereinafter, each part is demonstrated concretely.
The first filter selector 1, together with the second filter selector 3, selectively outputs an RF signal (high frequency signal) input according to the filter selection signal input from the control unit 4 to the specific frequency variable filter 2. To do.
[0005]
The frequency variable filter 2 includes a PIN diode, switches the tuning frequency by turning on / off the PIN diode, filters the RF signal input from the first filter selector 1, and outputs the filtered RF signal to the second filter selector. In this case, the PIN diode is turned on / off in accordance with a bias signal input from the control unit 3 described later.
[0006]
The frequency variable filter 2 is, for example, the first frequency variable filter 2a is 225 to 280 MHz, the second frequency variable filter 2b is 280 to 325 MHz, and the third frequency variable filter 2c is 32 5. The fourth frequency variable filter 2d is set to have a variable frequency width (frequency band in which the frequency variable filter 2 functions) so as to correspond to 370 to 400 MHz.
[0007]
The second filter selector 3 selectively receives an RF signal input from the frequency variable filter 2 selected by the first filter selector 1 in accordance with the filter selection signal input from the control unit 4. An RF signal is output to the outside.
[0008]
The on / off pattern generation circuit 41 of the control unit 4 receives a frequency designation signal representing the tuning frequency from the outside, generates an on / off pattern of the PIN diode of the frequency variable filter 2, and a plurality of bias generation circuits 43. Are output respectively.
[0009]
The filter selection circuit 42 of the control unit 4 inputs the RF signal to which frequency variable filter 2 and the output of the RF signal of which frequency variable filter 2 to the first filter selector 1 and the second filter selector 3. Then, a filter selection signal for instructing whether to output to the outside is output.
[0010]
The bias generation circuit 43 of the control unit 4 generates a bias signal based on the on / off pattern input from the on / off pattern generation circuit 41 and outputs the bias signal to the corresponding frequency variable filter 2. .
[0011]
Here, the bias generation circuit 43 of the control unit 4 will be specifically described with reference to FIG. FIG. 7 is a circuit diagram of the bias generation circuit 43 of the control unit 4.
As shown in FIG. 7, the bias generation circuit 43 receives an on / off pattern input, converts it into a TTL level signal, a first transistor Q1 that operates as a forward current switch, A first resistor R1 for limiting the base current of the first transistor Q1, a second resistor R2 for stabilizing the base current of the first transistor Q1, and a third resistor for limiting the forward current A second transistor Q2 that operates as a switch for grounding the bias signal to the reverse voltage, and a fourth resistor R4 that stabilizes the base voltage of the second transistor Q2, which is an output of the bias generation circuit 43. The fifth resistor R5 that limits the current when the reverse voltage is output and the capacitor C1 that limits the ground state of the second transistor Q2.
It is assumed that the fifth resistor R5 is a resistor having a sufficiently high resistivity.
[0012]
That is, in the bias generation circuit 43, the first transistor Q1 is turned on and the second transistor Q2 is turned off when the on / off pattern inputted through the buffer is in the Lo state (state representing on). Thus, the current limited by the third resistor R3 is output, and the current is output to the outside as it is.
[0013]
Further, when the on / off pattern is in the Hi state (a state representing off), the first transistor Q1 of the bias generation circuit 43 is turned off, the second transistor Q2 is turned on, and the capacitor C1 is saturated. Until the current is grounded, there is no current output to the outside, and when the capacitor C1 is saturated, the current due to the reverse voltage is output to the outside through the fifth resistor R5. It is.
[0014]
Since the bias generation circuit 43 corresponds to the switching operation of one PIN diode provided in the frequency variable filter 2, if ten switching operations are required, the circuit is provided corresponding to the number of the switching operations. It is what has been.
[0015]
Next, the operation of the conventional frequency variable filter device will be described.
First, the control unit 4 receives an input of a frequency signal, and the on / off pattern generation circuit 41 generates an on / off pattern corresponding to the frequency represented by the frequency signal and outputs it to the plurality of bias generation circuits 43.
On the other hand, the filter selection circuit 32 of the control unit 4 outputs a filter selection signal for selecting the variable frequency filter 2 corresponding to the frequency signal to the first filter selector 1 and the second filter selector 3.
[0016]
Then, each of the plurality of variable frequency filters 2 turns on / off the PIN diode in accordance with the bias signal input from the corresponding bias generation circuit 43 of the control unit 4 to switch the tuning frequency.
[0017]
The first filter selector 1 receives an RF signal input from the outside, and selectively outputs the RF signal to the frequency variable filter 2 corresponding to the filter selection signal input from the control unit 4. become.
Further, the second filter selector 3 selectively outputs the input of the RF signal from the frequency variable filter 2 corresponding to the filter selection signal input from the control unit 4.
[0018]
Here, for example, when the second frequency variable filter 2b is selected by the first filter selector 1 and the second filter selector 3 in FIG. 5, the first frequency variable filter 2a, The bias generation circuit 43 of the control unit 4 corresponding to the frequency variable filter 2c and the fourth frequency variable filter 2d also outputs a bias signal.
[0019]
[Problems to be solved by the invention]
As described above, the conventional frequency variable filter device has a problem in that power consumption increases because the frequency variable filter not selected by the filter selection signal also performs the ON / OFF operation of the PIN diode. .
[0020]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a frequency variable filter device that can reduce power consumption.
[0022]
[Means for Solving the Problems]
The present invention for solving the problems of the conventional example described above is a frequency variable filter device that filters an input high-frequency signal using a frequency represented by a separately input frequency signal as a tuning frequency and outputs the filtered signal to the outside. A plurality of frequency variable filters for switching the tuning frequency within a specific frequency region are provided so that the specific frequency regions are different from each other. Each frequency variable filter includes a PIN diode and is input from the outside. A tuning frequency is switched by turning on / off the PIN diode in accordance with a bias signal, a frequency variable filter to be output of the high frequency signal is selected by a filter selection signal, and the first filter selector is configured to select the frequency variable filter to be output by the filter selection signal. The frequency variable filter selected by 1 filter selector is A second filter selector for outputting a high-frequency signal to be applied, and a filter selection signal for selecting a frequency variable filter functioning at the frequency from the plurality of frequency variable filters based on a frequency represented by the frequency signal. And a bias signal for generating an on / off pattern of the PIN diode corresponding to the frequency and switching the tuning frequency to the frequency based on the on / off pattern in the selected frequency variable filter. The frequency variable filter that is not selected by the filter selection signal has a control unit that outputs a bias signal that minimizes the power consumption of the frequency variable filter, thereby reducing power consumption. it can.
[0023]
The present invention for solving the problems of the conventional example described above is the frequency variable filter device according to claim 1, wherein the control unit includes a bias generation circuit provided corresponding to each frequency variable filter, and the bias generation A control unit including an on / off pattern generation circuit provided corresponding to each of the circuits and a filter selection circuit, wherein the on / off pattern generation circuit expresses itself to a frequency signal input from the outside. If it corresponds to a frequency variable filter that functions at a certain frequency, an on / off pattern corresponding to the frequency is generated and output, and if it does not correspond, a corresponding bias generation circuit and An on / off pattern generation circuit that generates and outputs an on / off pattern that minimizes power consumption in the corresponding frequency variable filter. The bias generation circuit is a bias generation circuit that generates a bias signal from an on / off pattern input from a corresponding on / off pattern generation circuit and outputs the bias signal to a corresponding frequency variable filter, and the filter selection circuit includes: It is a filter selection circuit that outputs a filter selection signal for selecting a frequency variable filter that functions at a frequency represented by the frequency signal to the first filter selector and the second filter selector. Can be reduced.
[0024]
According to another aspect of the present invention, there is provided a variable frequency filter device according to claim 1, wherein the control unit includes a bias generation circuit provided for each of the variable frequency filters, / Off pattern generation circuit, a filter selection circuit, and a power supply control circuit, the on / off pattern generation circuit is an on / off pattern corresponding to the frequency represented by the frequency signal input from the outside An on / off pattern generation circuit that generates an off pattern and outputs the off pattern to a bias generation circuit. The bias generation circuit generates a bias signal from the on / off pattern that is input from the on / off pattern generation circuit. A bias generation circuit that outputs to the frequency variable filter that performs the frequency variable filter that functions at the frequency. A filter selection circuit that outputs a filter selection signal to be selected to a first filter selector and a second filter selector; and the power supply control circuit is provided only to a bias generation circuit corresponding to a frequency variable filter that functions at the frequency. It is a power supply control circuit that supplies power and does not supply power to a bias generation circuit that does not correspond to the frequency variable filter that functions at the frequency, and can reduce power consumption.
[0025]
According to another aspect of the present invention, there is provided a variable frequency filter device according to claim 1, wherein the control unit includes a bias generation circuit provided for each of the variable frequency filters, / Off pattern generation circuit and a filter selection circuit, wherein the on / off pattern generation circuit generates an on / off pattern corresponding to a frequency represented by an externally input frequency signal An on / off pattern generation circuit that outputs to the bias generation circuit, and the bias generation circuit generates the on / off pattern while an instruction signal instructing generation of a bias is input from the filter selection circuit. A bias signal is generated from an on / off pattern input from a circuit and output to a corresponding frequency variable filter, and an instruction signal is input A bias generation circuit that outputs a bias signal that minimizes power consumption in the corresponding frequency variable filter to the corresponding frequency variable filter when there is not, and the filter selection circuit selects the frequency variable filter that functions at the frequency A filter selection circuit that outputs a filter selection signal to the first filter selector and the second filter selector and outputs the instruction signal to a bias generation circuit corresponding to a frequency variable filter selected by the filter selection signal The power consumption can be reduced.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
The frequency variable filter device (this device) according to the present invention can reduce the power consumption by stopping the control of the frequency variable filter that is not selected.
[0027]
This apparatus is the same as the conventional frequency variable filter apparatus shown in FIG. 5, but the operation in the control unit 4 is slightly different.
As shown in FIG. 1, the control unit 4 of this apparatus includes an on / off pattern generation circuit 41 ′, a filter selection circuit 42, and a bias generation circuit 43. FIG. 1 is a configuration block diagram of the control unit 4 of the present apparatus.
Here, the filter selection circuit 42 and the bias generation circuit 43 are the same as those in the prior art, and thus description thereof is omitted.
[0028]
The on / off pattern generation circuit 41 ′ is provided corresponding to the bias generation circuit 43.
The on / off pattern generation circuit 41 'receives an input frequency signal, and if the frequency signal is a frequency band in which the frequency variable filter 2 corresponding to itself functions, the on / off pattern generation circuit 41' is the same as the conventional one. Is generated and output.
[0029]
Further, the on / off pattern generation circuit 41 ′ receives the frequency signal, and if the frequency signal is not a frequency band in which the frequency variable filter 2 corresponding to the frequency signal is functioning, the on / off pattern generation circuit 41 ′ It should be less.
The on / off pattern data with low power consumption is considered to be in an all-off state in the case of the bias generation circuit shown in FIG.
[0030]
According to this apparatus provided with such a control unit 4, the bias generation circuit 43 of the control unit 4 corresponding to the frequency variable filter 2 that does not function with respect to the frequency signal input to the control unit 4 does not generate a bias signal. By doing so, there is an effect that the on / off operation of the PIN diode in the frequency variable filter 2 is stopped, and the power consumption in the control unit 4 and the frequency variable filter 2 can be reduced.
[0031]
In addition to the on / off pattern generation circuit 41, the filter selection circuit 42, and the bias generation circuit 43 that are the same as those in the prior art, the control unit 4 of the present apparatus, as shown in FIG. The power supply control circuit 44 is configured to supply power only to the bias generation circuit 43 corresponding to the frequency variable filter 2 that functions as a function, and not to supply power to other bias generation circuits 43. It doesn't matter. FIG. 2 is another configuration block diagram of the control unit 4 of the present apparatus.
[0032]
According to the present apparatus, power is not supplied to the bias generation circuit 43 of the control unit 4 corresponding to the frequency variable filter 2 that does not function with respect to the input frequency signal. 2 is stopped, and the power consumption in the control unit 4 and the variable frequency filter 2 can be reduced.
[0033]
Further, as shown in FIG. 3, the control unit 4 of the present apparatus includes an on / off pattern generation circuit 41, a filter selection circuit 42 ′, and a bias generation circuit 43 ′ provided corresponding to the frequency variable filter 2. It consists of and. FIG. 3 is another configuration block diagram of the control unit 4 of the present apparatus.
Here, since the on / off pattern generation circuit 41 is the same as the conventional one, its description is omitted.
[0034]
The filter selection circuit 42 ′ receives a frequency signal, outputs a filter selection signal as in the prior art, and also generates a bias generation circuit 43 ′ corresponding to the frequency variable filter 2 that functions at the frequency represented by the frequency signal. A signal for instructing generation of a bias signal (instruction signal) is output to the other, and an instruction signal is not output to the other bias generation circuit 43 '.
[0035]
When receiving an instruction signal from the filter selection circuit 42 ′, the bias generation circuit 43 ′ outputs a bias signal in accordance with the on / off pattern signal input from the on / off pattern generation circuit 41 as in the prior art. This is generated and output to the corresponding frequency variable filter 2.
[0036]
The bias generation circuit 43 ′ is in a state where the power consumption is reduced when the instruction signal is not received from the filter selection circuit 42 ′, and the power consumption of the corresponding frequency variable filter is minimized. A bias signal is output.
[0037]
Specifically, it is conceivable that the bias generation circuit 43 'is as shown in FIG. FIG. 4 is a circuit diagram illustrating an example of the bias generation circuit 43 ′.
The bias generation circuit 43 'shown in FIG. 4 is substantially the same as the conventional bias generation circuit 43, but the buffer receives an on / off pattern input and an instruction signal input from the filter selection circuit 42'. It is replaced with a three-state buffer, and a pull-up resistor R6 is connected to its output, which is different from the conventional one.
[0038]
That is, the output of the three-state buffer of the bias generation circuit 43 ′ shown in FIG. 4 is in a high impedance state when no instruction signal is input from the filter selection circuit 42 ′. Accordingly, the bias generation circuit 43 ′ is in an all-off state by the action of the pull-up resistor R6.
[0039]
The three-state buffer of the bias generation circuit 43 ′ shown in FIG. 4 operates in the same manner as the buffer shown in FIG. 7 when a signal is input from the filter selection circuit 42 ′.
[0040]
According to the present apparatus, the bias generation circuit 43 of the control unit 4 corresponding to the frequency variable filter 2 that does not function with respect to the frequency signal input to the control unit 4 does not generate a bias signal. There is an effect that the on / off operation of the PIN diode in the frequency variable filter 2 is stopped, and the power consumption in the control unit 4 and the frequency variable filter 2 can be reduced.
[0042]
【The invention's effect】
According to the present invention, each frequency variable filter includes a PIN diode, and switches the tuning frequency by turning on / off the PIN diode in accordance with a bias signal input from the outside. The filter selection signal for selecting the frequency variable filter that functions at the frequency is output based on the frequency represented by the above, and the on / off pattern of the PIN diode is generated corresponding to the frequency, and the selected A bias signal for switching the tuning frequency to the frequency based on the on / off pattern is output to the frequency variable filter, and power consumption of the frequency variable filter is minimized for an unselected frequency variable filter. A bias signal is output, and the first filter selector is input from the outside. A frequency variable filter that outputs a frequency signal to a frequency variable filter selected by a filter selection signal, and a second filter selector selects and outputs a high frequency signal output from the frequency variable filter selected by the first filter selector. Since it is an apparatus, there is an effect that power consumption can be reduced by minimizing power consumption in a frequency variable filter that does not function at the frequency specified by the frequency signal.
[0043]
According to the present invention, when the control unit is provided corresponding to each of the bias generation circuits and corresponds to the frequency variable filter that functions at the frequency represented by the frequency signal input from the outside, An on / off pattern generation circuit that generates an on / off pattern that generates power and minimizes power consumption in the corresponding bias generation circuit and frequency variable filter, and outputs the on / off pattern. Select a bias generation circuit that generates a bias signal from the on / off pattern input from the on / off pattern generation circuit and outputs it to the corresponding frequency variable filter, and a frequency variable filter that functions at the frequency represented by the frequency signal. according to claim 1, wherein a control unit and a filter selection circuit for outputting a filter selection signal to Since the wave number variable filter device, and a variable frequency filter which does not function in the frequency specified by the frequency signal, and the power consumption of the bias generating circuit corresponding thereto to minimize the effect of reducing the power consumption.
[0044]
According to the present invention, the control unit generates an on / off pattern corresponding to the frequency represented by the frequency signal input from the outside, and outputs the on / off pattern to the bias generation circuit, and the frequency A power supply control circuit that supplies power only to a bias generation circuit corresponding to a frequency variable filter that functions at a frequency represented by a signal and does not supply power to other bias generation circuits, and an on / off pattern a bias generation circuit for generating a bias signal receiving input, according to claim 1, wherein a control unit and a filter selection circuit for outputting a filter selection signal for selecting the frequency variable filter function in the frequency represented in the frequency signal Since the frequency variable filter device of the frequency variable filter does not function at the frequency specified by the frequency signal, By not outputting a bias signal for the corresponding frequency variable filter, so as not to operate the bias generating circuit corresponding thereto, there is an effect that power consumption can be reduced.
[0045]
According to the present invention, the control unit generates an on / off pattern corresponding to the frequency represented by the frequency signal input from the outside, and outputs the on / off pattern to the bias generation circuit, and the filter selection circuit When an instruction signal is received from the input signal, a bias signal is generated according to the input on / off pattern, and when no instruction signal is input, a bias signal that minimizes power consumption in the frequency variable filter is output. A bias generation circuit that selects and a filter selection signal that selects a frequency variable filter that functions at the frequency represented by the frequency signal, and outputs an instruction signal to the bias generation circuit corresponding to the frequency variable filter, and a bias that does not The generating circuit is a control unit having a filter selection circuit that does not output an instruction signal. Since the variable frequency filter apparatus of claim 1, wherein the variable frequency filter which does not function in the frequency specified by the frequency signal, and the power consumption of the bias generating circuit corresponding thereto to minimize the effect of reducing the power consumption.
[Brief description of the drawings]
FIG. 1 is a configuration block diagram of a control unit 4 of the present apparatus.
FIG. 2 is another configuration block diagram of the control unit 4 of the present apparatus.
FIG. 3 is another configuration block diagram of the control unit 4 of the present apparatus.
FIG. 4 is a circuit diagram illustrating an example of a bias generation circuit 43 ′.
FIG. 5 is a configuration block diagram of a conventional frequency variable filter device.
6 is a block diagram showing the configuration of a control unit 4. FIG.
7 is a circuit diagram of a bias generation circuit 43 of the control unit 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 1st filter selector, 2 ... Frequency variable filter, 3 ... 2nd filter selector, 4 ... Control part, 41, 41 '... On / off pattern generation circuit, 42, 42' ... Filter selection circuit, 43, 43 '... Bias generation circuit, 44 ... Power supply control circuit

Claims (4)

In the frequency variable filter device that filters the input high-frequency signal as a tuning frequency using the frequency represented by the separately input frequency signal,
A plurality of frequency variable filters for switching the tuning frequency within a specific frequency region are provided so that the specific frequency regions are different from each other,
Each frequency variable filter includes a PIN diode, and switches a tuning frequency by turning on and off the PIN diode according to an externally input bias signal.
A first filter selector that selects a variable frequency filter to be output of the high-frequency signal by a filter selection signal;
A second filter selector that outputs a high-frequency signal output from the variable frequency filter selected by the first filter selector according to the filter selection signal;
Based on the frequency represented by the frequency signal, a filter selection signal for selecting a frequency variable filter that functions at the frequency from the plurality of frequency variable filters is output, and the PIN diode is turned on / off corresponding to the frequency. An off pattern is generated, and a bias signal for switching the tuning frequency to the frequency based on the on / off pattern is output to the selected frequency variable filter, and the frequency variable filter that is not selected by the filter selection signal Includes a control unit that outputs a bias signal that minimizes power consumption of the frequency variable filter. The control unit includes a bias generation circuit provided corresponding to each frequency variable filter, an on / off pattern generation circuit provided corresponding to each of the bias generation circuits, and a filter selection circuit. Because
The on / off pattern generation circuit generates an on / off pattern corresponding to the frequency when the on / off pattern generation circuit corresponds to a frequency variable filter that functions at a frequency represented by a frequency signal input from the outside. On / off pattern generation circuit that generates and outputs an on / off pattern that minimizes power consumption in the corresponding bias generation circuit and the corresponding frequency variable filter if the output is not supported. And
The bias generation circuit is a bias generation circuit that generates a bias signal from an on / off pattern input from a corresponding on / off pattern generation circuit and outputs the bias signal to a corresponding frequency variable filter,
The filter selection circuit is a filter selection circuit that outputs a filter selection signal for selecting a frequency variable filter that functions at a frequency represented by the frequency signal to the first filter selector and the second filter selector. The frequency variable filter device according to claim 1, wherein: The control unit is a control unit including a bias generation circuit provided corresponding to each of the frequency variable filters, one on / off pattern generation circuit, a filter selection circuit, and a power supply control circuit,
The on / off pattern generation circuit is an on / off pattern generation circuit that generates an on / off pattern corresponding to a frequency represented by an externally input frequency signal and outputs the generated on / off pattern to a bias generation circuit.
The bias generation circuit is a bias generation circuit that generates a bias signal from an on / off pattern input from the on / off pattern generation circuit and outputs the bias signal to a corresponding frequency variable filter,
The filter selection circuit is a filter selection circuit that outputs a filter selection signal for selecting a frequency variable filter that functions at the frequency to the first filter selector and the second filter selector,
The power supply control circuit supplies power only to a bias generation circuit corresponding to a frequency variable filter that functions at the frequency, and does not supply power to a bias generation circuit that does not correspond to the frequency variable filter that functions at the frequency. 2. The frequency variable filter device according to claim 1, wherein the frequency variable filter device is a control circuit. The control unit is a control unit including a bias generation circuit provided corresponding to each frequency variable filter, one on / off pattern generation circuit, and a filter selection circuit,
The on / off pattern generation circuit is an on / off pattern generation circuit that generates an on / off pattern corresponding to a frequency represented by an externally input frequency signal and outputs the generated on / off pattern to the bias generation circuit.
The bias generation circuit responds by generating a bias signal from an on / off pattern input from the on / off pattern generation circuit while an instruction signal instructing generation of a bias is input from the filter selection circuit. A bias generation circuit that outputs to the corresponding frequency variable filter a bias signal that minimizes power consumption in the corresponding frequency variable filter when the instruction signal is not input to the frequency variable filter.
The filter selection circuit outputs a filter selection signal for selecting a frequency variable filter functioning at the frequency to the first filter selector and the second filter selector, and the frequency variable filter selected by the filter selection signal The frequency variable filter device according to claim 1, wherein the filter selection circuit outputs the instruction signal to a bias generation circuit corresponding to.

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