A 14-bit MOSFET-only second order delta-sigma modulator for capacitive sensor interfaces

Abstract

InversionAbshXt-A 14-bit MOSFET-only 2" order )-E modulator for capacitive sensors interfaces has been implemented using a 0.7um CMOS process. The circuit is based in the substitution of linear capacitors by MOS capacitors in a Switch capacitor architecture. The circuit present low fabrication cost, small area, and high matching. The proposal was tested comparing two different )-E modulators, one with linear capacitors and the MOS-only version. Similar results were obtained for both modulators Accumulation