Injection-locked video frequency oscillator

Details Injection-locked video frequency oscillator Injection-locked video frequency oscillator

1985-06-25

1986-09-23

LaRoche, Eugene R.

Oscillators

Plural oscillators

Oscillator used to vary amplitude or frequency of another...

331 55, 358 31, H03B 104

Patent

active

046138285

ABSTRACT:
A pair of crystal-controlled oscillators generate respective signals at specific frequencies that are useful in processing a video signal, such as in providing clock-driven signal delay or producing a subcarrier signal. The frequencies are used in such a way that they feed through into the frequency spectrum of the processed video signal. Though the frequencies are nominal multiples of each other they cannot be maintained invariant because of normal circuit conditions, such as ambient temperature variations and circuit aging. The frequencies therefore mix and a difference frequency develops in the processed video signal. By injecting a suitable harmonic of the lower frequency signal into the crystal oscillator generating the higher frequency signal, the higher frequency will lock to variations in the lower frequency. The difference frequency consequently disappears.

REFERENCES:
patent: 3996610 (1976-12-01), Kawamoto
patent: 4195309 (1980-03-01), Christopher et al.
Electronics Designers' Handbook, ed. by R. W. Landee et al, McGraw-Hill Book Co., 1977, (pp. 16-3 to 16-8).

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