AGC APPARATUS CONCURRENTLY SATISFYING SUFFICIENT IMPEDANCE MATCHING CHARACTERISTIC AND LINEAR AGC CHARACTERISTIC

摘要

It is a low cost AGC device that provides sufficient impedance matching characteristics and linear AGC characteristics. The AGC device is provided with a linear calibration circuit. The linear calibration circuit corrects the control voltage x from the control voltage generator circuit and outputs the corrected control voltage w to the variable gain amplifier circuit. The above mentioned calibration is a calibration such that the change in decibel value of any AGC gain with respect to the control voltage (x) is linear.