JPH1155044A - High frequency power amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable optimum adjustment of the current of an amplifier circuit which linearly amplifies a high frequency signal corresponding to a surrounding temperature, power supply voltage or input power change. SOLUTION: The level of an HF signal inputted from an input terminal 31 is regulated by a variable attenuator 1, and this signal is inputted to a transistor 7. An amplified output passes through matching circuits 8, 9 and 10 and a coupler 12 and reaches a terminal 32. The partial output extracted by the coupler 12 is detected and read from a terminal 34 into a control part 20. On the other hand, the current of this amplifier is digitally converted by an A/D 28, the power supply voltage by an A/D 26 and further the peripheral temperature by an A/D 30 and are read into a CPU 22. Corresponding to the inputs from the A/D 26, 28, 29 and 30, the CPU 22 controls D/A 25 and 27 and adds/ subtracts its output or gain. Even when the peripheral temperature or power supply voltage of the amplifier changes, this amplifier functions to keep the optimum state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0101]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifying means for linearly amplifying a high-frequency signal, which is used in order to control the amplifying means in accordance with a combination of a fluctuation of a power supply voltage, a fluctuation of a surrounding temperature and the like. And a high-frequency power amplifier having a learning function for learning in advance.

[0092]

2. Description of the Related Art FIG. 2 is a diagram showing a configuration of a conventional high frequency power amplifier, wherein (1) is a variable attenuator for controlling the gain of the high frequency power amplifier, (2) and (3). Is a capacitor for matching, (4) is a volume for adjusting the current of the high frequency power amplifier, (5) (6)
Is a resistor and a diode for temperature compensation, (7) is an amplifying transistor, (8) is a tuning coil, (9) and (10) are matching capacitors, (11) and (14) are bypass capacitors, and (12). Is a coupler for detecting output power, (13) is a detection diode, (15) (1)
6) (17) is a DC amplifier circuit for amplifying an output from the detection diode (13), (31) is an input terminal of the high-frequency power amplifier, (32) is an output terminal of the high-frequency power amplifier, (33) is a power supply terminal, (34) is an output terminal of a detection diode, and (35) is a reference voltage terminal of a DC amplifier circuit. The level of the high-frequency signal applied to the input terminal (31) of the high-frequency power amplifier is adjusted by a variable attenuator, and the matching capacitors (2) and (3)
Is applied to the amplification transistor (7). The variable resistor (4) is for adjusting the current of the amplifying transistor (7), and the resistor (6) and the diode (5) are for temperature compensation. The amplified output is matched at (8), (9), and (10), and output from the output terminal (32) via the coupler (12). A part of the output power is taken out by the coupler (12), detected by the diode (13) and the bypass capacitor (14), and amplified by the DC amplifier circuits (15), (16) and (17) via the terminal (34). And
It is compared with the voltage of the reference voltage terminal (35), and controls the amount of attenuation of the variable attenuator (1) according to the output. When the output of the amplifier circuit increases, the attenuation of the variable attenuator (1) is increased to reduce the gain of the entire amplifier circuit.

[0093]

Since the conventional high-frequency power amplifying device is constructed as described above, the current of the amplifier circuit for linearly amplifying the high-frequency signal remains preset, and the surrounding high-frequency signal is not amplified. Since the adjustment cannot be performed in accordance with a change in temperature, a change in power supply voltage, a change in input power, or the like, there is a problem that an extra large current must be supplied for safety. According to the present invention, the current of an amplifier circuit for linearly amplifying a high-frequency signal can be optimally adjusted according to a change in ambient temperature, a change in a power supply voltage, a change in input power, and the like. An object of the present invention is to realize an efficient high-frequency power amplifier that can be operated.

[0093]

The current of an amplifier circuit for linearly amplifying a high-frequency signal according to the present invention is optimal according to a change in ambient temperature, a change in power supply voltage, or a change in input power. Function to be adjusted to.

[0056]

According to the present invention, the current of the amplifier circuit is controlled by a procedure learned in advance according to a change in the surrounding temperature, a change in the power supply voltage, a change in the input power, and the like. It has a calculation function for optimizing parameters.

[0086]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the high-frequency power amplifier of the present invention will be described below with reference to the drawings. In FIG. 1, (1) is a variable attenuator for controlling the gain of the amplifying device, (2)
(3) is a capacitor for matching, (4) is a fixed resistor for limiting the current of the amplifying device, (5) (6)
Is a resistor and a diode for temperature compensation, (7) is an amplifying transistor, (8) is a tuning coil, (9) and (10) are matching capacitors, (11) and (14) are bypass capacitors, and (12). Is a coupler for detecting output power, (13) is a detection diode, (18) is a shunt for detecting the current of the amplifying device, (19) is a temperature detector, and (20) is a control unit. , (21) is a bus line, (22) is a microprocessor, (23) is RO
M, (24) is EEPROM, (25) (27) is D /
A, (26) (28) (29) (30) are A / D, (3
1) is an input terminal of the amplification device, (32) is an output terminal of the amplification device, (33) is a power supply terminal, and (34) is an output terminal of the detection diode.

In FIG. 1, a high-frequency signal applied to an input terminal (31) of the amplifying device is supplied to a variable attenuator (1).
The level is adjusted by the matching capacitor (2)
It is added to the transistor for amplification (7) via (3). The fixed resistor (4) is for limiting the current of the amplifying transistor (7), and has a D / D in the control unit (20).
The current flowing through A (26) is controlled and the resistance (6)
And the diode (5) are for temperature compensation. The amplified output is supplied to a matching circuit (8) (9) (10)
Are output from the output terminal (32) via the coupler (12). Coupler (12)
, A part of the output power of the amplifying device is taken out, detected by the diode (13) and the bypass capacitor (14), and passed through the terminal (34) to the control unit (20).
Are converted into digital signals by the A / D (30) and read by the microcomputer (22). On the other hand, the current flowing through the amplifying device is a shunt (18)
Is converted into a digital signal by an A / D (30) connected to the A / D (30) and read by the microprocessor (22), and the power supply voltage applied to the amplifying device is A / D (2).
The signal is converted into a digital signal by 6) and read by the microprocessor (22), and the temperature around the amplifying device is converted into a digital signal by the A / D (30) and read by the microprocessor (22). Microprocessor (22) is A / D (26) (28)
(29) According to the digital signal from (30), D / A (2
5) Control (27). When the output of the amplification device increases, the attenuation of the variable attenuator (1) is increased,
Besides controlling to reduce the gain of the whole amplification device,
It functions to keep the amplifying device in an optimal state even when the temperature around the amplifying device changes or the power supply voltage changes.

On the other hand, the amplifying apparatus is, for example, a D / A that keeps the amplifying apparatus in an optimum state in a state where the ambient temperature is forcibly set to −30 ° C., + 20 ° C., or + 60 ° C.
(25) The value of (27) is learned in advance and the result is EEP
The temperature stored in the ROM (24) can be complemented by a calculation function programmed in the ROM (23) for temperatures other than the above temperatures. In addition, when the input power of the amplifying device is reduced, the current of the amplifying device is limited to a necessary minimum, thereby realizing an efficient amplifying device.

In the above description, a single-stage high-frequency power amplifying device has been described, but control can be similarly performed in a multi-stage case. Also, the method of controlling the current, the method of controlling the gain, the method of detecting the output power, the current and the voltage, and the like have been described by way of example, but other similar methods are conceivable. Further, although the description has been given of the linear amplifier, the present invention can be similarly applied to a non-linear amplifier.

[0102]

Since the present invention is constructed as described above, it is stable against a change in the surrounding temperature or a change in the power supply voltage. When the input power becomes small, the current of the amplifying device is reduced to a necessary minimum. By limiting to the limit, an efficient high-frequency power amplifier can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a high-frequency power amplifier of the present invention.

FIG. 2 is a configuration diagram showing an example of a conventional high-frequency power amplifier.

[Explanation of symbols]

1 Variable Attenuator 2, 3 Matching Capacitor 4 Current Limit / Fixed / Adjusted for Adjustment
Variable resistor 5 Temperature compensation resistor 6 Temperature compensation diode 7 Amplifying transistor 8 Tuning coil 9, 10 Matching capacitor 11, 14 Bypass capacitor 12 Coupler 13 Detection diode 15, 16, 17 DC amplifier 18 Current shunt 19 Temperature sensor 20 Control unit 21 Bus line 22 Microprocessor 23 ROM 24 EEPRPM 25, 27 D / A 26, 28, 29, 30 A / D 31 Input terminal of the amplifying device 32 Output terminal of the amplifying device 33 Power supply terminal 34 Detection Output terminal 35 DC amplifier reference voltage terminal

Claims (2)

[Claims] Amplifying means for linearly amplifying a high-frequency signal; detecting means for detecting output power of the amplifying means; control means for controlling a gain of the amplifying means; Detecting means for detecting a current flowing through the means, control means for controlling the current, and detecting means for detecting a temperature around the amplifying means;
Detecting means for detecting a power supply voltage of the amplifying means, and having a learning function for learning a control procedure for controlling the control means in advance according to a combination of fluctuations of the detecting means. High frequency power amplifier 2. The high-frequency power amplifier according to claim 1, further comprising a calculation function for optimizing control parameters to complement said learning function.