PHASE LOCKED LOOP FOR A DRIVER CIRCUIT FOR OPERATING A MEMS GYROSCOPE

摘要

The invention relates to a phase locked loop for a driver circuit for operating a MEMS gyroscope with a seismic mass which can be excited to oscillate, comprising an input interface for receiving position signals representing the current position of the oscillating seismic mass of the MEMS gyroscope, a phase detector for determining the phase and frequency of the current oscillation movement of the seismic mass on the basis of the received position signals, at least two oscillators which can be alternatively activated, wherein the oscillators which can be alternatively activated have a different energy consumption and/or different noise properties, and at least one output interface for outputting a signal provided by the oscillator that is currently activated.