Sound detecting circuit and amplifier circuit thereof

摘要

Disclosed is a sound detecting circuit which includes a sensing unit configured to generate an AC signal in response to a sound pressure level of a sound signal; an amplification unit configured to amplify the AC signal; and a bias voltage generating unit configured to generate a bias voltage to be provided to the amplification unit. The bias voltage generating unit comprises a current source configured to provide a power current; and a current-voltage converting circuit configured to convert the power current into the bias voltage and to reduce a noise due to the power current.

主权项

1. A sound detecting circuit comprising:
a sensing unit configured to generate an AC signal in response to a sound pressure level of a sound signal; an amplification unit configured to amplify the AC signal; and a bias voltage generating unit configured to generate a bias voltage to be provided to the amplification unit, wherein the bias voltage generating unit comprises: a current source configured to provide a power current; and a current-voltage converting circuit configured to convert the power current into the bias voltage and to reduce a noise due to the power current, wherein the bias voltage generating unit further comprises a resistance circuit that is connected to and disposed between an output terminal of the sensing unit and the current-voltage converting circuit, and wherein the sensing unit comprises a capacitor-type sensor, and the resistance circuit and the capacitor-type sensor constitute an RC filter.