JPS6239323U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a high frequency amplification device according to an embodiment of this invention, and FIG. 2 is a block diagram of a conventional high frequency amplification device. 2...variable attenuator, 3 is a high frequency amplifier, 4 is a temperature detector, 6 is a directional coupler, 7 is a wave detector, 8 is an output power setting device, 9 is an error amplifier, 10 is an amplitude limiter, 11 is an adder. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] The above-mentioned high-frequency amplification device is equipped with a temperature detector that detects the temperature near the high-frequency amplification section and a variable attenuator that controls the amount of attenuation of the amplification input based on the detected temperature, and reduces fluctuations in the amplification output due to temperature fluctuations. A directional coupler that branches out a part of the amplified output, a detector that detects a DC signal from the branched high-frequency output, an output power setting device that sets the output power of the amplification section, and the detected DC signal. an error amplifier that detects the difference between and the output power set value and outputs an error signal; an amplitude limiter that limits the error signal to a predetermined value; and an amplitude limiter that adds the temperature detection signal and the partial pressure error signal to the variable attenuator. What is claimed is: 1. A high-frequency amplifying device comprising: an adder that generates an attenuation control signal; the device stabilizes the amplified output through negative feedback operation and also performs temperature compensation of the amplified gain.