SYSTEM AND METHOD FOR LOW DISTORTION CAPACITIVE SIGNAL SOURCE AMPLIFIER

摘要

PURPOSE: System and method are provided to process a high sound input signal without introducing high nonlinearity into a system. CONSTITUTION: An amplifier(108) outputs an amplifier microphone signal to an output pad(118). A peak detector(110) detects a peak signal from the output of the amplifier and sets an attenuator(106) according to the output of the peak detector. The attenuator is a variable capacitance implemented by using a capacitor array capable of switching. A bias generator(104) provides bias voltage for microphone(102) itself in a pin(116). [Reference numerals] (102) MEMS microphone; (104) Bias generator; (106) Attenuator; (110) Peak detector; (112) Controller