6533b852fe1ef96bd12ab59b

RESEARCH PRODUCT

CMOS Capacitance-to-Time Converter-Based Interface for Differential Capacitive Sensors

Candid ReigM. Dolores Cubells-beltranAndrea De MarcellisGildas LegerHala Darwish

subject

business.industryComputer scienceCapacitive sensingElectrical engineeringCapacitancelaw.inventionMicrocontrollerCMOSInterfacinglawHardware_INTEGRATEDCIRCUITSOperational amplifierResistorbusinessXOR gate

description

This paper presents pre-layout simulation results on a CMOS implementation of a capacitance-to-time converter-based electronic interface for differential capacitive sensors. Its simple architecture, comprising only three operational amplifiers (OA) and a digital mixer (inverted XOR gate) allows, by properly setting the values of seven biasing resistors, to fit the working range anywhere from few fF to hundreds of pF, giving the output quasi-digital signals (T and PW) in the useful μs-ms range (appropriate for direct interfacing with general purposes microcontrollers). A couple of illustrative examples are provided.

yearjournalcountryeditionlanguage
2020-09-042020 Global Congress on Electrical Engineering (GC-ElecEng)
https://doi.org/10.23919/gc-eleceng48342.2020.9286269