Low-Power, Continuous-Time Sigma-Delta Interface for Micromachined Gyroscopes Employing a Sub-Nyquist-Sampling Technique

Microgyroscope control system using a high-order band-pass continuous-time sigma-delta modulator

“…Consequently, the detection mode of a micromachined vibratory gyroscope lends itself to being incorporated in a band-pass force feedback control loop. Moreover, a control system based on a high-order M has better noise-shaping, and can be operated at relatively low sampling frequencies [11][12][13][14][15]. Continuous-time (CT) circuits are easy to be prototyped using discrete components and have very low power consumption if implemented as an ASIC [14].…”

“…Moreover, a control system based on a high-order M has better noise-shaping, and can be operated at relatively low sampling frequencies [11][12][13][14][15]. Continuous-time (CT) circuits are easy to be prototyped using discrete components and have very low power consumption if implemented as an ASIC [14]. Most importantly, relatively mature design techniques for band-pass analogue to digital converters (ADC) can be applied to a gyroscope detection mode force feedback control system.…”