Patent ID: 6194973
Filing Date: 2001-02-27
Classification: H03B

Abstract:
An oscillation circuit having an adjustable gain, the oscillation circuit comprising:a resonator having a first terminal and a second terminal;a first amplifier having an input coupled to the first terminal of the resonator and an output coupled to the second terminal of the resonator, the first amplifier for amplifying oscillations of the resonator according to a gain;an oscillation detector having a first input coupled to the first terminal of the resonator and a second input coupled to the second terminal of the resonator, the oscillation detector having an output and generating at the output a rectified periodic signal in response to oscillations of the resonator at the first and second terminals; anda second amplifier coupled to receive the output of the oscillation detector, the second amplifier providing feedback to the first amplifier based on the amplitude of the rectified periodic signal to limit the gain of the first amplifier.