TH29457A - Stabilized bridged oscillator circuits and methods - Google Patents

Abstract

DC60 (17/04/40) Devices and methods are revealed for improving the oscillation frequency stability of the oscillator signal generated by an oscillator circuit in the desired form of this invention. A quartz crystal resonator is one arm of the bridge, which generates a bridge signal that changes according to the resonator oscillation frequency. A corresponding demodulator responds to the bridge signal to generate an error signal, which is converted into a control signal. A control circuit receives the control signal and changes its reactance when the resonator ceases oscillating at an undisturbed resonant frequency, at which point the resonator oscillation frequency connected to the control circuit is returned to the resonant frequency. An automatic level control circuit is also included for controlling the absorption level of the signal that excites the resonator. Devices and methods are revealed for improving the oscillation frequency stability of the oscillator signal generated by an oscillator circuit in the desired form of this invention. A quartz crystal resonator serves as one arm of the bridge, generating a bridge signal that varies according to the resonator's oscillation frequency. A corresponding demodulator responds to the bridge signal to generate an error signal, which is then converted into a control signal. The control circuit receives the control signal and changes its reactance when the resonator ceases oscillating at an undisturbed resonant frequency. The resonator's oscillation frequency connected to the control circuit is then returned to the resonant frequency. An automatic level control circuit is also integrated to regulate the drive level of the resonator excitation signal.

Claims (1)

1. Oscillator circuits for stabilizing oscillator signals with variable frequency consist of Resonators for operation at various frequencies that include Resonant frequency And has an impedance resonator An isolation bridge circuit built with a resonator as one arm. And there are points one and two Bridge circuits respond to the frequency of Change the resonator to be built at point one as First bridge signal Bridge circuits are built and arranged in In which the phase shift leads or follows the phase of the first bridge signal. By moving the phase t tag: