Variable frequency oscillator

Details Variable frequency oscillator Variable frequency oscillator

1991-11-27

1993-07-20

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 2, H03L 700

Patent

active

RE0343170

ABSTRACT:
A variable frequency oscillator circuit adapted for stabilization of its free-running frequency comprises a first signal synthesizing circuit, first voltage-controlled oscillator, a phase-locked loop and reference signal generator, the phase-locked loop consisting of a second signal synthesizing circuit, second voltage-controlled oscillator, phase comparator and low-pass filter. The first and second signal synthesizing circuits have the same characteristics, and the first and second voltage-controlled oscillators have the same characteristics. The reference signal and output of the second voltage-controlled oscillator are input to the phase comparator. The comparator output is applied to the first and second signal synthesizing circuits. An external signal is applied to the first signal synthesizing circuit, and the output of the first voltage-controlled oscillator acts as the output of the variable frequency oscillator circuit.
The principles are applied to reading data pulses from a floppy disk.

REFERENCES:
patent: 3328718 (1967-06-01), Murray
patent: 4117420 (1978-09-01), DeConinck et al.
patent: 4198659 (1980-04-01), Iijima et al.
patent: 4358741 (1982-11-01), Nardin
"Improving Frequency Acquisition of a Costas Loop" by Charles Cahn, IEEE transactions on Communications, vol. Com. 25, No. 12, Dec. 1977 pp. 1453-1459.

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