Patent ID: 9559647
Date: 2017-01-31
CPC Classifications: H03F,H04R

Claim:
1. An amplifier circuit for a capacitive transducer, comprising: a preamplifier adapted to receive a transducer signal through an input node and to provide an amplified signal at an output node; and a transconductance amplifier comprising a first input and an output, wherein the first input of the transconductance amplifier is connected to the output node, and the output of the transconductance amplifier is connected to the input node, wherein a capacitive attenuator circuit is connected between the output of the transconductance amplifier and the input node of the preamplifier, wherein the transconductance amplifier further comprises a second input connected to a reference voltage source, and wherein the transconductance amplifier is configured to provide a signal at the output that corresponds to the difference between the signals applied to its first and its second input.