Self-oscillating driver circuit for a quartz resonator of an ang

Details Self-oscillating driver circuit for a quartz resonator of an ang Self-oscillating driver circuit for a quartz resonator of an ang

1993-09-13

1996-01-23

Voeltz, Emanuel T.

Boots, shoes, and leggings

364481, 364480, G01R 2504

Patent

active

054870151

ABSTRACT:
A drive circuit provides approximately zero phase shift across the terminals of a resonator, and provides a constant excitation of the resonator, while cancelling variation due to the shunt capacitance. For complex demodulation of an angular rate signal from a vibrating quartz angular rate sensor, the drive circuit also provides an in-phase reference signal and a quadrature-phase reference signal. Preferably, the drive circuit includes an adjustable phase shifter connected in a feedback loop including the resonator for adjusting a phase shift of a periodic signal circulating in the feedback loop, and the adjustable phase shifter includes a Hilbert transformer for producing an in-phase signal and a quadrature-phase signal, and a combiner circuit connected to the Hilbert transformer for combining a selected amount of the quadrature signal with the in-phase signal to produce a result shifted by a selected amount of phase. The drive circuit also includes a phase detector responsive to phase shift across the resonator terminals for adjusting the phase shifter for obtaining a phase shift of approximately zero across the terminals. An automatic gain control is included in the feedback loop for obtaining a constant level of excitation of the resonator by the periodic signal. The feedback loop also has an adaptive circuit for canceling a component of the periodic signal passing through shunt capacitance of the resonator between the resonator terminals.

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