Research and Test of the Digital Phase Locked Loop Drive Technology for Silicon Micro-Machined Gyroscope

Abstract

A program of digital phase locked loop (DPLL) drive is proposed to supply the gaps including debugging complex, easiness of interference and poor flexibility in the traditional analog drive loop of the silicon micro-machined gyroscope (SMG). The program, i.e. field programmable gate array (FPGA) is utilized to process the drive sensitive signal of the SMG after the analog to digital (A/D) processing of high-precision, has been utilized to achieve phase and amplitude closed-loop of the SMG’s drive mode. The simulation and test results show that the program has a great advantage to reduce the requirements on quality factor compared with the original program. When the gyroscope with a low quality factor is not easy to vibrate by the analog self-excited drive circuit, the program is adopted to reach drive mode’s frequency stability of 18ppm.