Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1996-07-01
1998-01-13
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331116R, 331139, 331158, 331177V, 331183, H03B 532, H03L 702
Patent
active
057083940
ABSTRACT:
An apparatus and method are disclosed for improving the stability of the frequency of vibration of an oscillator signal produced by an oscillator circuit. In a preferred embodiment of the present invention, a quartz crystal resonator is one arm of a bridge which generates a bridge signal which varies in accordance with the vibrating frequency of the resonator. A synchronous demodulator responds to the bridge signal for producing an error signal which is converted into a control signal. A control circuit receives the control signal and changes its reactance when the resonator is no longer vibrating at its unperturbed resonance frequency so that the vibration frequency of the resonator connected to the control circuit is returned to its resonant frequency. An automatic level control circuit is also included for controlling the drive level of the signal exciting the resonator.
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Les Hurley, "A Temperature-Controlled Crystal Oscillator," 43rd Annual Symposium on Frequency Control--1989, pp. 55-57, no month.
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John R. Vig, Raymond L. Filler and John A. Kosinski, "SC-CUT Resonators for Temperature Compensated Oscillator," Proceedings of the 36th Annual Frequency Control Symposium (1982), pp. 1-6, no month.
Grimm Siegfried H.
Hewlett--Packard Company
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