Automatic frequency control circuit for television horizontal os

Details Automatic frequency control circuit for television horizontal os Automatic frequency control circuit for television horizontal os

1977-12-28

1979-05-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 20, 331 27, 331 34, 331111, 331177R, 358156, 358159, H03B 304, H04N 504

Patent

active

041550498

ABSTRACT:
An automatic frequency control circuit comprising two switching transistors with the emitter-collector paths thereof connected in series with each other between a power source and a reference voltage source, a horizontal synchronizing signal being commonly coupled to the bases of the switching transistors, an integrating circuit having an input terminal receiving a horizontal pulse signal and an output terminal connected to the emitter-collector juncture between said two switching transistors, a smoothing circuit to convert the output voltage of said integrating circuit into a d-c voltage, and a voltage controlled oscillator to produce a frequency output in accordance with the d-c output voltage of the smoothing circuit, the output of said oscillator being fed back to the input terminal of said integrating circuit.

REFERENCES:
patent: 3593179 (1971-07-01), Hovens et al.
patent: 3885201 (1975-05-01), Fernsler
Fitchen, "Electronic Integrated Circuits and Systems," Van Nostrand Reinhold Company, New York, pp. 122-134, 1970.
Wilcox, "A TV Horizontal I/C," IEEE Transactions on Broadcast and Television Receivers, vol. BTR-19, Feb. 1973, pp. 65-72.

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