Automatic gain control method and device

摘要: An automatic gain control method and device capable of maintaining the within a predetermined proper range by first amplifying an input analog signal from microphone or like, then sampling amplified while comparing voltage thereof with reference voltage, when number times that is higher than exceeds times, varying stepwise in response to every excess beyond times. Consequently it becomes possible eliminate necessity amplifier sufficient bandwidth A-D converter, hence realizing manufacture improved composed single-chip CMOS integrated circuit, further advantages minimizing required component parts, reducing production processes, achieving integration density lowering power consumption.