A MOSFET-only second order delta-sigma modulator for capacitive sensor interfaces

Author

Cama, J. M Gómez ; Bota, S.A. ; Montané, E. ; Samitier, J.

Author_Institution

Dept. d´´Electron., Barcelona Univ., Spain

Volume

3

fYear

1999

fDate

1999

Firstpage

1689

Abstract

A 14-bit MOSFET-only 2^nd order Δ-Σ modulator has been implemented in a 0.7 μm CMOS process for capacitive sensors interfaces. A switched capacitor architecture that allows the substitution of linear capacitors by MOS capacitors has been developed. These circuits have low cost fabrication, small area, and high matching. This proposal was tested comparing two different Δ-Σ modulators, one with linear capacitors and the MOS-only version. Similar results were obtained for both modulators

Keywords

CMOS integrated circuits; capacitive sensors; delta-sigma modulation; integrated circuit design; modulators; signal processing equipment; switched capacitor networks; Δ-Σ modulator; 0.7 micron; 14 bit; MOS capacitors; MOSFET-only delta-sigma modulator; capacitive sensor interfaces; high matching; low cost fabrication; second order delta-sigma modulator; switched capacitor architecture; CMOS technology; Capacitance; Capacitive sensors; Circuit testing; Costs; Delta modulation; MOS capacitors; MOSFET circuits; Switches; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on

Conference_Location

Pafos

Print_ISBN

0-7803-5682-9

Type

conf

DOI

10.1109/ICECS.1999.814500

Filename

814500