AUTOMATIC GAIN CONTROLLERS AND CONTROL METHODS FOR CONTROLLING VOLTAGE OF AUTOMATIC GAIN CONTROLLERS

摘要

PROBLEM TO BE SOLVED: To provide an automatic gain controllers and methods of control in which a peak level and a bottom level of an automatic gain amplifier output are digitized and a control voltage of the voltage controlled gain amplifier can be controlled in a digital manner.;SOLUTION: An automatic gain controller includes a voltage control gain amplifier, a level detector, an analog-digital converter, a peak detector, and a voltage controller. The voltage control gain amplifier amplifies input signals in response to a control voltage and produces output signals. The level detector detects peak and bottom levels of the output signals of the voltage control gain amplifier. The analog-digital converter converts the detected peak and bottom levels into digital signals. The peak detector detects a digital peak in response to a difference between the digital peak level and the digital bottom level. The voltage controller compares the digital peak level and a reference voltage, and controls the control voltage.;COPYRIGHT: (C)2007,JPO&INPIT