Low-noise amplifier for micro-electro-mechanical systems (mems) microphones

Abstract

Extended dynamic range of a Micro-Electro-Mechanical System (MEMS) microphone circuit is accomplished in low-noise amplifier circuits and their methods of operation. The circuits are amplifier circuits that receive an input signal from a MEMS microphone, and include an input terminal for connection to a terminal of the MEMS microphone, a low-noise amplifier that has an input coupled to the input terminal, and an inverting charge pump circuit that generates a negative power supply voltage from an external positive voltage power supply. An output of the inverting charge pump circuit is coupled to a negative power supply terminal of the low-noise amplifier. In some embodiments, the MEMS microphone has a pair of terminals that are coupled to a pair of input terminals of the low-noise amplifier, which is a low-noise differential amplifier.

Dependencies are inferred from the claim text.