JP2007074039A - Power amplifying circuit, bias control method of power amplifying circuit, bias control program of power amplifying circuit, and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power amplifying circuit and a bias adjustment method thereof for eliminating the need for a circuit component such as a semi-fixed resistor for bias adjustment of the power amplifying circuit, eliminating useless power consumption to the utmost extent in response to a modulation system and a radio wave form, and capable of simply carrying out works such as bias adjustment at factory shipment. <P>SOLUTION: The power amplifying circuit includes: a memory means for storing bias setting data corresponding to the radio wave form, the modulation system, or transmission channel information; a D/A conversion means for converting output data from the memory means into an analog bias signal; and a control CPU, and the CPU reads the corresponding bias setting data from the memory means when any of the radio wave form, the modulation system, or the transmission channel information is designated and supplies the data to required sections via the D/A conversion means as a bias signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power amplifier circuit and a bias adjustment method thereof, and more particularly to a power amplifier circuit for a transmitter that can support a plurality of radio wave formats and modulation methods and a bias adjustment method thereof.

In a high-frequency power amplifier circuit, particularly a circuit that amplifies a high-frequency signal modulated with an audio signal or a data signal in a transmitter, class A, class B, class C depending on the modulation method and radio wave format in consideration of power efficiency The optimum method is adopted from the different operation methods (operation classes). For example, in amplitude modulation (AM), since the amplitude value of a modulated signal waveform is transmitted as information, it is necessary to amplify the amplitude waveform of a high-frequency signal after modulation without distortion. A class amplifier circuit is used, or a class B push-pull circuit and a class AB push-pull circuit are used, in which the positive and negative sides of the amplitude waveform are separately amplified by class B or class AB amplification. In phase modulation (PM) and frequency modulation (Frequency Modulation), phase and frequency information only needs to be transmitted, and amplitude information may be lost, so a power efficient class C amplifier circuit is used. Is done. Further, in a pulse modulation system such as pulse width modulation (PWM), a class D, class E, class F,... Excellent in power efficiency are also used.
In addition, since a considerable amount of heat is generated in the power amplifier circuit, a temperature compensation circuit is necessary so as not to deviate from an appropriate bias current or voltage range due to heat. In particular, in a semiconductor such as a transistor or FET, the bias current / voltage due to temperature varies greatly, so that a temperature compensation means is indispensable. As the temperature compensation circuit, for example, a device using a temperature sensitive element such as a thermistor whose resistance value changes depending on temperature, a device using the temperature dependence of the pure direction bias voltage of the diode, or the like is used.

FIG. 5 is a diagram showing an example of a high-frequency power amplifier circuit provided with a conventional temperature compensation means. The circuit shown in this example includes an inverse L-type input matching circuit 51, a grounded power transistor 52, a bias supply choke coil 53 connected to the base b of the transistor 52, and the other end of the choke coil 53 and the ground. A connected high frequency bypass capacitor 54, a temperature compensating diode 55 connected in parallel with the capacitor, a power supply choke coil 56 inserted between the collector c of the power transistor 52 and the power source E (+ pole), a power choke A high frequency bypass capacitor 57 connected between the other end of the coil 56 and the ground, an output matching circuit 58 on the output side, a switch SW inserted between the power source E and the other end of the bias supply choke coil 53 and semi-fixed It consists of a series circuit with a resistor VR.
This circuit supplies a bias current to the base of the power transistor 52 via the switch SW and the semi-fixed resistor 53. As is well known, a large current flows from the collector to the emitter in accordance with the bias current flowing from the base to the emitter. Current amplification is performed, and this base current when there is no signal determines the bias. The temperature compensation of this circuit is performed by the diode 55. That is, when the temperature rises, the forward bias voltage between the base and the emitter of the power transistor 52 (about 0.7 V at room temperature) becomes small, and the value of the semi-fixed resistor VR for current adjustment inserted in series with this. Is constant, the bias current increases, and an excessive collector current flows accordingly. Therefore, if a temperature compensation diode is inserted between the power supply terminal of the bias supply choke coil 53 and the ground as shown in the figure, the bias voltage is applied to the base in the same manner as the bias voltage between the base and the emitter of the power transistor. Since the supplied potential changes, the collector current is kept constant. The switch SW is brought into a contact state when a bias voltage is required, but is opened as a class C amplifier circuit without supplying a bias voltage by opening the switch, as a class A amplifier circuit or a class AB amplifier circuit. When operating, the switch SW can be in a contact state to supply a required bias voltage.
JP-A-8-330854

By the way, in the above-described conventional power amplifier circuit, the semi-fixed resistor for the bias supply circuit is for absorbing variations of individual power amplifiers of the transmitter to be assembled and manufactured. By precisely setting the values at each stage, the bias value of each product is set appropriately, which is indispensable for maintaining quality. These adjustment parts are usually placed on the power amplifier circuit board, but the high-frequency power circuit is strictly shielded metal so that unnecessary radio signals do not leak or external noise is not mixed in. A cover is generally applied. When placed on the same substrate as circuit components such as power transistors, use a non-metallic screwdriver or other adjustment tool from the adjustment hole provided in the shield cover with the transmitter housing disassembled for final adjustment. However, adjusting a component in the vicinity of a high-temperature circuit operating at a high temperature involves a risk of electric shock of the operator. Furthermore, in the current situation, adjustment in a state different from the actual use state requires considerable skill and time to accurately adjust so as to obtain a correct value when assembled.
For this reason, a semi-fixed resistor may be placed outside the amplifier circuit board and adjusted from the backside of the transmitter housing, etc., but there are many parts that are restricted in the layout of parts and have been subjected to strict high-frequency bypass measures. In other words, there are disadvantages such as an increase in the complexity of assembly such as the routing of the signal line and the addition of a connector for connecting the printed circuit boards, and an increase in cost.
On the other hand, in the case of an amplitude modulation method that requires amplification without distortion, the power amplification circuit is class A or class AB, and in the case of a frequency modulation method that does not require that, power efficiency is given priority and class C operation is performed. As described above, the use of the power amplifier circuit is as described above, but when the signals of the modulation schemes having different operation classes are amplified by one power amplifier circuit, the AB class bias and the C class bias are appropriately switched. Although it is necessary, hitherto, there has been no known device that can achieve this easily at a practical level. For example, it is conceivable to arrange a large number of semi-fixed resistors corresponding to each modulation method on the amplifier circuit board, and to switch these each time the operation class of the amplifier circuit is changed. It was lacking in practicality.
The present invention has been made in order to solve the problems of such a conventional power amplifier circuit for a transmitter, and eliminates the need for circuit components such as a semi-fixed resistor for bias adjustment of the power amplifier circuit, In addition, according to the modulation method and radio wave format, a power amplifying circuit and a bias adjustment method thereof are provided that can eliminate unnecessary power consumption as much as possible and can easily perform a bias adjustment operation at the time of shipment from the factory. The purpose is to do.

In order to achieve the object of the present invention, in the power amplifying circuit according to claim 1, memory means storing bias setting data corresponding to radio wave format, modulation method or transmission channel information, and output data of the memory means are converted into analog data. When any of D / A conversion means for converting to a bias signal and radio wave format, modulation method or transmission channel information for operating the transmitter is designated, the corresponding bias setting data is read from the memory means. And a control CPU for supplying a required signal as a bias signal via the D / A conversion means.
According to a second aspect of the present invention, the power amplifier circuit according to the first aspect further comprises temperature information detection means, and temperature compensation information is added to the bias setting data, and the temperature information obtained by the temperature information detection means is added. Based on this, a bias signal subjected to temperature compensation is supplied to a required part.
According to a third aspect of the present invention, the power amplifying circuit according to the first or second aspect further comprises means for detecting the presence / absence of an input of a modulation signal, and the bias signal is not signaled during a period when the modulation signal is not input. It is characterized by switching to the mode and reducing idling current.
5. The bias control method for a power amplifier circuit according to claim 4, wherein in the bias control method for the power amplifier circuit of a wireless transmitter, when any one of a radio wave format, a modulation method, and transmission channel information is designated, the radio wave format, the modulation A method of reading bias setting data stored in advance corresponding to the transmission channel information, a process of converting the read bias setting data into an analog bias signal, and a process of supplying the required part as a bias signal It is characterized by including.
According to a fifth aspect of the present invention, there is provided a bias control program for a power amplifier circuit in which the bias control method for the power amplifier circuit according to the fourth aspect is programmed so as to be controllable by a computer.
The invention described in claim 6 is a recording medium in which the bias control program for the power amplifier circuit described in claim 5 is recorded in a computer-readable format.

In the power amplifying circuit of the wireless transmitter according to claim 1 of the present invention, necessary bias information of the power amplifying circuit is stored in memory for each radio wave format, modulation method, or transmission channel, and the information is stored as necessary. Since the configuration of the power amplifier circuit device is set based on the above, a bias adjusting component such as a semi-fixed resistor can be dispensed with. Such a function is also useful for adjustment at the time of shipment from the factory, and can be stored in the memory including fine adjustment such as bias current setting by an adjustment measuring device or the like. is there.
According to the second aspect of the present invention, since the temperature information detecting means is provided and the temperature compensation information is added to the bias signal setting data in the first aspect, the temperature compensation effect is further included in the effect of the first aspect of the invention. be able to.
According to a third aspect of the present invention, in the first or second aspect, the apparatus further comprises means for detecting the presence / absence of the input of the modulation signal, and during the period when the modulation signal is not input, the bias signal is switched to the no-signal mode, Therefore, it is useful for simplifying the heat dissipation mechanism and reducing the size of the entire apparatus.
According to the fourth aspect of the present invention, when any one of the radio wave format, the modulation method, and the transmission channel information is designated, the bias setting data stored in advance corresponding to the radio wave format, the modulation method, and the transmission channel information is read. And a method for converting the read bias setting data into an analog bias signal, and a process for supplying the bias setting data to a required unit as a bias signal. The present invention can be realized as software processing using the control means or using various functional blocks, and the same effect as that of the first aspect of the invention can be obtained.
In the fifth aspect of the invention, since the computer controls the bias control method of the power amplifier circuit according to the fourth aspect of the present invention so as to be controllable by the computer, the computer is programmed according to the OS that can be controlled by the computer, so that the computer having the same OS can be used. If there is, it can be controlled by the same processing method, and effects similar to those of the respective inventions can be obtained by installing in a computer.
According to the sixth aspect of the invention, since the bias control program for the power amplifier circuit according to the fifth aspect is recorded in a computer-readable format, the program can be executed anywhere by carrying the recording medium.

Hereinafter, the present invention will be described in detail using the illustrated embodiments. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
First, before describing an embodiment of the present invention, the relationship between the operation class of the power amplifier circuit and the bias will be briefly described. FIG. 1 is a diagram illustrating a signal waveform and an operating point of an amplifier circuit for explaining a difference in bias between operation classes of a general amplifier circuit. FIG. 5A shows a class A (A class), and a bias current is supplied so that the entire amplitude of the input signal is included in the operation region of an amplifier such as a transistor. The vertical axis in the figure indicates the collector current ic, and the wavy line Ic in the center indicates the zero point of the input signal, that is, the level of the collector current (Ic) that flows when the input signal is zero. As is apparent from this figure, even when the input signal is at a zero level, current flows and power is consumed. Theoretically, the power efficiency of the class A amplifier circuit is 50% in the best state. FIG. 1B shows a class B amplifier circuit, and the bias current is set so that the collector current flows only with respect to the amplitude signal on one of the plus side and the minus side of the input signal. Since no current flows during the period when there is no input signal, the power efficiency is improved to about 78.5%. FIG. 1C is referred to as class AB, and is set so that a bias current flows slightly from class B in order to reduce crossover distortion near the signal level zero in class B. Used as a class push-pull. FIG. 1D shows a class C amplifier circuit which is set so that the collector current flows only for a part of the waveform of the signal by further reducing the bias current from that of the class B. The class C amplifier circuit loses linearity and generates large distortion components such as harmonics, and is therefore used as a tuning amplifier circuit with a tuning circuit and a resonance circuit added to the output side.
The operation class of the amplifier circuit is set by setting the base current / voltage in a transistor, the grid voltage in a vacuum tube, and the gate voltage in an FET, for example.

FIG. 2 is a schematic configuration diagram showing an embodiment of the power amplifier circuit according to the present invention.
The circuit shown in this example is obtained by applying the present invention to the circuit shown in FIG. In the figure, reference numeral 1 denotes an inverse L-type input matching circuit, which supplies the output signal of the preceding amplifier circuit (not shown) to the base b of the power transistor 2 of the next emitter grounded while impedance matching is being performed. . A series circuit of a bias supply choke coil 3 and a high-frequency bypass capacitor 4 is connected between the base b of the power transistor 2 and the ground, and a digital-analog conversion circuit (to be described later) is connected to the connection point between them. D / A) output signal is supplied. A series circuit of a high-frequency blocking power choke coil 6 and a high-frequency bypass capacitor 7 is connected between the collector c of the power transistor 2 and the ground, and power is supplied from the power source E via the current detection circuit 9. Amplified high-frequency signals that are supplied with amplification power and are generated on the collector side of the power transistor 2 are guided through an output matching circuit 8 to an antenna (not shown).

The feature of the present embodiment is that the detection signal of the current detection circuit 9 described above is supplied to an analog / digital conversion circuit (hereinafter referred to as A / D), and the output voltage of the power source E is detected by the voltage detection circuit 10, A detection result signal is supplied to the A / D. The A / D is connected to a radiator temperature detection circuit 11 that detects the temperature of the radiator of the power amplification circuit and an ambient temperature detection circuit 12 that detects the ambient temperature. Further, both the A / D and the D / A are connected to a CPU that performs bias control, and at least data, a clock signal, an enable signal, and the like are exchanged. Further, the CPU is provided with a memory 13, and the memory 13 includes modulation method information such as AM (amplitude) modulation, FM (frequency) modulation, PM (phase) modulation, or CW (Continuous Wave). Data such as DSB (Double Side Band), SSB (Single Side Band), or related channel information, transmission band information, data and programs necessary for bias control are stored.
According to this configuration, at the time of shipment adjustment at a factory or the like, it is necessary together with various data as described above using various adjustment jigs including a computer so that a desired bias current value is obtained in an actual operation state. Bias setting data including fine adjustment data is stored in the memory. At this time, if the bias setting data after compensation necessary for giving a correct bias current at each temperature is included based on the information obtained in the temperature test, temperature compensation can be performed at the same time. Therefore, in the example shown in FIG. 2, the temperature compensating diode is omitted. In actual mass production, roughly data is recorded in advance based on the design, and it is often only necessary to finely adjust some errors during shipping adjustment.

  In this way, when necessary bias setting data is stored in the memory, when actually using the power circuit, when starting the transmitter, setting the channel, or biasing as necessary When the adjustment instruction is given, the analog signals output from the temperature detection circuits 11 and 12 are converted into digital signals by A / D and then taken into the CPU. At this time, if the collector current at the time of no signal is detected by the current detection circuit 9, the actual idling current (the collector current at the time of no signal, the bias current means the base current at the time of no signal) can be known. This is useful for more accurate bias current control. Since the voltage information of the power source E is detected by the voltage detection circuit 10, this voltage value is also taken into the CPU. Based on this information, the bias setting data corresponding to the modulation method, radio wave format, etc. stored in relation to the channel information is read from the memory, and various calculations are performed by the CPU. / A. In D / A, the supplied bias current control signal is converted into an analog signal of DC current / voltage (current / voltage indicates either or both of current and voltage), and the choke coil for bias supply is converted. 3 is supplied to the base of the power transistor 2 via 3. For example, when the set channel is to be activated as an FM transmitter, the bias current is calculated and set to activate as a class C power amplifier circuit, and in the case of AM, the class AB power amplifier circuit is configured. A bias current is set. This control may be performed even during a period in which the power amplifier circuit is actually used, periodically, in a standby state where the transmitter is not activated, or during reception. For example, since the temperature of the radiator is different between when the transmitter is started and when it is transmitted for a while, at least the temperature monitoring and the accompanying bias current control must be monitored in the required cycle to control the bias current / voltage. is there.

Since D / A converts the input digital signal into an analog signal according to a predetermined algorithm, a bias current control signal (digital signal) is output from the CPU in consideration of the side, and D / A From A, a necessary DC voltage / current value is supplied to the power transistor.
Further, in this example, since the temperature detection circuit 11 for the radiator and the (atmosphere temperature detection circuit 12) are provided as temperature information, the amount of heat generated by the power amplification circuit itself can be known from both of them. If the bias current control is performed based on the above, it becomes possible to control the temperature more accurately, but the bias current control is also possible by detecting either one of the temperatures. What is necessary is just to use the circuit network of a thermistor and a resistor etc. which are described also in patent document 2 shown.
In the above description, the example in which the bias current / voltage control is performed so as to switch between the class C operation and the class A operation in the case of FM modulation and AM modulation is shown. The present invention is applicable. For example, CW (Continuous Wave) that transmits information depending on the presence / absence of a carrier signal is similar to the amplitude modulation method, but it is only necessary to transmit the presence / absence of a carrier. Power amplification of operation is sufficient. In addition, since the SSB has conventionally used a class AB power amplifier circuit, it is necessary to switch bias control finely according to these modulation methods and radio wave formats, and to perform bias setting that consumes as little idle current as possible. Is possible. On the other hand, it is possible to perform a class A operation for the purpose of reducing distortion by SSB.

  FIG. 3 shows a modification of the present invention. The difference from FIG. 2 is that the conventional diode 5 shown in FIG. 5 is used as temperature compensation means. As described above, since temperature compensation needs to respond quickly to the heat generated by the power amplifier circuit in real time, it may be more efficient to use conventional temperature compensation means. In this case, the temperature dependency of the forward bias voltage of the temperature compensation diode 5 is used, and even if the voltage changes depending on the temperature, the required current must be passed. It would be better to insert a current buffer circuit 14 between the temperature compensating diode 5. Thus, if the conventional method is used together as the temperature compensation means, the amount of data stored in the memory 13 is reduced, and the burden on the CPU is reduced. 2 and the method shown in FIG. 3 are used together, and the method shown in FIG. 2 is used for the adjustment at the time of factory shipment and the bias adjustment in the periodic temperature compensation. The temperature compensation during use of the power amplifier circuit can also be performed by a conventional method.

FIG. 4 shows another modification of the present invention. In this example, a field effect transistor 42 is used instead of a transistor, and the FET has characteristics similar to a vacuum tube. Since the gate voltage control for bias control hardly involves current consumption, the current buffer circuit 14 of FIG. 3 is not necessarily required. Also, FETs are less susceptible to damage due to thermal runaway than power transistors, so a temperature compensation circuit with a strong protective meaning is not necessary as much as transistor circuits, so the output power of the power amplifier circuit and the maximum loss of the FET used If there is a margin in power capacity, it may be omitted.
Although illustration is omitted, if the above-described bias adjustment procedure is programmed to be controllable by a computer based on a required OS, this transmitter can be used in any transmitter by using a computer (CPU) equipped with the same OS. The invention can be used. As a processing procedure when the present invention is used as a bias control method, for example, when any one of radio wave format, modulation method, or transmission channel information is designated, the bias setting data memory stored in advance as described above is used. Processing for reading bias signal setting data stored in advance corresponding to radio wave format, modulation method, transmission channel information, processing for converting the read bias setting data into an analog bias signal by A / D, What is necessary is just to control the bias of a power amplifier circuit so that the process supplied as a bias signal to a required part may be included. Further, if such a bias control method for the power amplifier circuit is programmed based on an OS that can be controlled by a computer, the present invention can be easily implemented by a CPU equipped with a similar OS. Furthermore, if the bias control program is recorded in a computer-readable format, the program can be executed anywhere by carrying the recording medium.

Although specific circuit configurations of the present invention have been described above, the present invention is not limited to these, and may employ only some functions, and various other modifications are possible.
For example, if the current detection circuit 9 functions to prevent excessive current when the transmitter load fluctuates, it is not necessary to reflect the current detection result in the bias current / voltage control during actual operation. It may be used only for monitoring the occurrence of excess current. In this case, the overcurrent detection function may be confirmed by setting the test mode at the time of shipment from the factory. Alternatively, if the current detection accuracy of the current detection circuit 9 is increased and a minute current value can be detected, the no-signal current without a modulation signal can be monitored as the idling current value itself, so that the idling current can be automatically controlled. It is also possible to do this.
Even when the AM modulation transmission circuit functions, the power amplifier circuit may operate in class A or class AB only during a period in which the modulation signal is actually input. Thus, only when a modulation signal is detected, the bias current / voltage is set to class A or class AB, and the idling current is set to zero in the non-signal mode during the other non-signal period. Furthermore, even in AM modulation, when the signal input level is high, the idling current is increased, and when the modulation input signal is small, the idling current is reduced accordingly, so that there is no loss of signal amplitude information. (No distortion), and the total current consumption can be greatly reduced. That is, the bias current / voltage is changed in accordance with the amplitude level of the modulation signal to obtain the minimum required idling current (the idling current is a bias current / voltage for operating the amplifier circuit in each class. Means the collector current that flows when there is no signal).

In recent years, since an increasing number of DSPs (Digital Signal Processors) are used to process modulated signals and the like, it is relatively easy to detect the presence / absence of a modulated signal and the level of a modulated signal. At that time, even if the bias current / voltage is changed to class A, if it takes time to rise, or if time is required for level detection, etc., the modulated signal is delayed and supplied to the transmitter. It is also feasible. According to this method, even in the class A power amplifier circuit, the idling current is greatly reduced and the amount of heat generation is also reduced. Therefore, there is an extremely great effect in reducing the size and power consumption of the transmission circuit.
By adopting the present invention and eliminating the variable resistor of the bias adjustment circuit and controlling it digitally by the CPU, it is possible to freely adjust the bias of the transmitter at the time of shipment from the factory and change the bias at the time of operation. Therefore, use examples and effects other than those described above can be expected.
The CPU, current detection circuit, temperature detection circuit, and the like required in the present invention are conventionally equipped with a number of radio units for other purposes. Therefore, when implementing the present invention, the number of parts is greatly increased. The number of wires and the number of wirings will not increase significantly, and even if the cost increases, the effect of reducing the adjustment man-hours at the time of factory shipment can be made much larger.

The present invention is not limited only to the above-described embodiments. Each function constituting the bias control circuit of the power amplifier circuit according to the above-described embodiment is programmed, written in advance on a recording medium such as a CD-ROM, and the like in a medium driving device such as a CD-ROM drive mounted on a computer. It goes without saying that the object of the present invention can be achieved by mounting the CD-ROM or the like, storing these programs in a memory or storage device of a computer, and executing them.
In this case, the program itself read from the recording medium realizes the functions of the above-described embodiment, and the program and the recording medium recording the program also constitute the present invention.
As a recording medium for storing the program, a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical medium (for example, DVD, MO, MD, CD, etc.), a magnetic medium (for example, magnetic tape, flexible disk, etc.) ) Or the like.
Further, not only the functions of the above-described embodiment are realized by executing the loaded program, but also the above-described implementation by cooperating with the operating system or other application programs based on the instructions of the program. The case where the function of the form is realized is also included.
When distributing to the market, store the program on a portable recording medium for distribution, or store the program in a storage device of a server computer connected via the Internet, etc. It can also be transferred to a computer. In this case, the storage device of this server computer is also included in the recording medium of the present invention.
In the computer, the functions of the above-described embodiments are realized by installing a program on a portable recording medium or a transferred program on a recording medium connected to the computer and executing the installed program. Is done.

It is a signal waveform diagram showing an example of the operation of the bias current and amplifier circuit controlled in the present invention. 1 is a schematic configuration diagram showing an embodiment of a power amplifier circuit according to the present invention. It is a schematic block diagram which shows the deformation | transformation embodiment of the power amplifier circuit which concerns on this invention. It is a schematic block diagram which shows other one Embodiment of the power amplifier circuit which concerns on this invention. It is a schematic block diagram which shows an example of the conventional power amplifier circuit.

Explanation of symbols

  1, 51 Input matching circuit, 2, 52 Power transistor, 3, 53 Bias supply choke coil, 4, 7, 54, 57 High frequency bypass capacitor, 5, 55 Temperature compensation diode, 6, 56 Power supply choke coil 8, 58 Output matching circuit on output side, 9 Current detection circuit, 10 Voltage detection circuit, 11, 12 Temperature detection circuit, 13 Memory, 14 Buffer circuit, 42 FET, D / A Digital / analog conversion circuit, A / D Analog / digital conversion circuit, E power supply circuit, CPU control circuit, VR variable resistor, SW switch.

Claims (6)

  A power amplifying circuit for a wireless transmitter, comprising: memory means for storing bias setting data corresponding to radio wave format, modulation method or transmission channel information; and D / D for converting output data of the memory means into an analog bias signal. When any one of the A conversion means and the radio wave format, modulation method, or transmission channel information for operating the transmitter is designated, the corresponding bias setting data is read from the memory means and the D / A conversion means is passed through. And a control CPU for supplying the required part as a bias signal.   2. The apparatus according to claim 1, further comprising temperature information detecting means, adding temperature compensation information to the bias setting data, and providing a bias signal subjected to temperature compensation based on the temperature information obtained by the temperature information detecting means. A power amplifying circuit characterized by being supplied to a part.   3. The method according to claim 1, further comprising means for detecting whether or not a modulation signal is input, wherein the bias signal is switched to a no-signal mode and the idling current is reduced during a period when the modulation signal is not input. A power amplifier circuit.   In the bias control method of the power amplifying circuit of the wireless transmitter, when one of the radio wave format, modulation scheme, or transmission channel information is designated, the bias stored in advance corresponding to the radio wave format, modulation scheme, transmission channel information A bias control method for a power amplifying circuit, comprising: a process of reading setting data; a process of converting the read bias setting data into an analog bias signal; and a process of supplying the required part as a bias signal.   A bias control program for a power amplifier circuit, wherein the bias control method for a power amplifier circuit according to claim 4 is programmed to be controlled by a computer.   6. A recording medium in which the bias control program for a power amplifier circuit according to claim 5 is recorded in a computer-readable format.

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