| 摘要 |
<p>An automatic microwave gain control device comprises a signal amplifier, a directional coupler connected to one side of terminals of the signal amplifier for taking out a part of microwave signal power, a microwave detection diode connected to one end of the directional coupler, a bias supply circuitry supplying an adjustable D.C. bias voltage to the microwave detection diode, a D.C. amplifier for amplifying a voltage derived from an addition of a microwave detection output voltage of the microwave detection diode and the bias voltage of the bias supply circuitry, and a variable attenuator provided at another side of the terminals of the signal amplifier, wherein the variable attenuator controls an output power outputted from an output terminal to be constant power by way of controlling a magnitude of attenuation of the signal at the another side of the terminals of the signal amplifier according to an output voltage of the D.C. amplifier so as not to be affected by dispersion of characteristic and dispersion of mounting position of the microwave detection diode. This invention is also applicable to a down-converter and an up-converter. <IMAGE></p> |
