Patent ID: 9042578
Filing Date: 2015-05-26
Classification: H03F,H04R

Abstract:
1. A microphone amplifier, comprising: a microphone terminal for connecting a microphone, in particular a MEMS microphone; an amplifier circuit with an amplifier input, connected to the microphone terminal, and an amplifier output that is connected to an output of the microphone amplifier, wherein the amplifier circuit is designed to amplify an input signal at the amplifier input in order to generate an output signal at the amplifier output; and an overload circuit that is designed to detect the existence of an overload state within the amplifier circuit based on a detection signal at a node within the amplifier circuit that is different from the amplifier input and the amplifier output and to connect the amplifier input via a switching element, in particular with a low impedance, to a reference potential terminal if the overload state is detected for more than a predetermined time span.