Servo device for rapidly, and with low noise, locking the freque

Details Servo device for rapidly, and with low noise, locking the freque Servo device for rapidly, and with low noise, locking the freque

1988-12-02

1990-02-27

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 23, H03L 710

Patent

active

049049577

ABSTRACT:
A device is provided for locking the frequency and phase of a signal to that of a signal imposed, of the phase locked type. It comprises a modulator mixing a signal whose frequency is proportional to that of a reference signal coming from an oscillator. The low frequency component of the combined signal (isolated by an integrator) is permanently applied to the oscillator to an input with relatively low sensitivity, for the fine corrections, and to a high speed loop comprising a storage element and an amplifier, through a switch controlled by a window comparator. The high speed loop is connected to a higher sensitivity input. The high speed loop only acts during the setting period, for bringing the control voltage of the oscillator back to close to the optimum voltage, the optimization being provided by the permanent loop.

REFERENCES:
patent: 4409563 (1983-10-01), Vandegraaf
patent: 4433308 (1984-02-01), Hirata
patent: 4748425 (1988-05-01), Heck
Patent Abstracts of Japan, vol. 10, No. 113 (E-399)[2170], 26 Apr. 1986, p. 137 E 399; JP-A-60 249 429 (FUJITSU K.K.), 10/12/85.
IBM Technical Disclosure Bulletin, vol. 21, No. 6, Nov. 1978, pp. 2482-2483, New York, U.S.; D. R. Irvin: "FM Angle Modulator With Frequency Compensated Deviation".

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