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Capacitive interface circuit for low power sensor system | Kapazitative Schnittstellenschaltung für ein Sensorsystem mit niedriger Leistung | Circuit d'interface capacitive pour système de capteur de faible puissance

Patentnummer:EP2192387B1
IPC Hauptklasse:G01D000524
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Erfinder:
Anmeldung:24.04.07
Offenlegung:28.09.06
Patenterteilung:10.01.18

Abstract / Hauptanspruch
This disclosure describes a capacitive interface circuit for a low power system. The capacitive interface circuit is configured to achieve very low noise sensing of capacitance-based transducers, such as a micro-electromechanical system (MEMS)-based sensor, with high resolution and low power. The capacitive interface circuit uses a differential amplifier and correlated triple sampling (CTS) to substantially eliminate, or at least reduce, kT/C noise, as well as amplifier offset and flicker (1/f) noise, from the output of the amplifier. The capacitive interface circuit may further include an output stage that reduces glitching, i.e., clock transients, in the output signal by allowing transients in the amplifier output to settle. In this manner, the circuit can be used in a low power system to produce a stable, low-noise output.

EP2192387B1


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