Phase-locked drive loop with amplitude regulation based on phase-shifting for gyroscopes

This paper presents a phase-locked drive loop for gyroscopes with an amplitude regulation based on phase-shifting. Instead of regulating the AC or DC value of the driving stage in order to maintain a constant primary oscillation, this concept introduces a tunable phase delay into the driving loop. Compared to conventional amplitude regulation this concept is advantageous, since the high voltages of the driving stage can be set to a constant value and do not have to be adjusted. This reduces the complexity of the analog circuitry enormously and eases the use of higher driving voltages. Additionally this concept provides a sampling frequency for a sigma-delta modulator readout interface.