Patent ID: 9510108
Filing Date: 2016-11-29
CPC Classification: H04R

Claim Text:
1. A circuit module for a silicon condenser microphone, comprising: a charge pump; a first amplifier; a second amplifier with an input port thereof connecting to an output port of the first amplifier; a transducer with an input port thereof connecting to the charge pump and an output port thereof connecting to an input port of the first amplifier; a reaction circuit connected between the output port of the first amplifier and the input port of the transducer; a first bias circuit for providing working voltage to the transducer cooperatively with the charge pump; an isolator connected between the output port of the transducer and the input port of the first amplifier for isolating direct-current components of a first electrical signal produced by the transducer; a second bias circuit for providing bias voltage to the first amplifier.