Patent ID: 9625272
Date: 2017-04-18
CPC Classifications: B81B,G01C,G01P

Claim:
1. A method for canceling quadrature error of a MEMS device signal, the method comprising: providing oscillation motion information using a drive charge amplifier coupled to a proof mass of a MEMS device; providing first sense information using a first sense charge amplifier coupled to the proof mass, the first sense information corresponding to a first movement of the MEMS device; providing amplified oscillation motion information using a first programmable amplifier and the oscillation motion information; canceling first quadrature error of the first sense information using a first summer and the amplified oscillation motion information to provide quadrature-corrected first sense information; shifting a phase of the oscillation motion information 90 degrees using a first state of a phase shifter to provide carrier information; shifting a phase of the oscillation motion information zero degrees using a second state of the phase shifter to calibrate a gain of the first programmable amplifier; and demodulating the quadrature-corrected first sense information using a first multiplier, the quadrature-corrected first sense information, and the carrier information to provide demodulated first sense information.