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1. (WO2017040123) DIFFERENTIAL SIGMA-DELTA CAPACITANCE SENSING DEVICES AND METHODS

Pub. No.:    WO/2017/040123    International Application No.:    PCT/US2016/048220
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Wed Aug 24 01:59:59 CEST 2016
IPC: G06F 3/045
Applicants: CYPRESS SEMICONDUCTOR CORPORATION
Inventors: GRADINARIU, Iulian C.
Title: DIFFERENTIAL SIGMA-DELTA CAPACITANCE SENSING DEVICES AND METHODS
Abstract:
A capacitance sensing device can include a reference circuit configured to connect to a reference capacitance, and to generate an electrical reference signal that varies over time according to the reference capacitance and a compare signal; a sense circuit configured to connect to a sense capacitance, and to generate an electrical sense signal that varies over time according to a sense capacitance; a compare circuit having compare inputs coupled to receive the sense signal and the reference signal, and a compare output that provides the compare signal; and a value generation circuit configured to generate an output value corresponding to the compare signal over a predetermined time period.