Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1975-01-02
1976-09-14
Kominski, John
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 16, 331 1A, 331 36C, 325422, 334 15, H03B 304
Patent
active
039809684
ABSTRACT:
A television tuning system has a ramp voltage source including an electrical current source and an electrical current sink coupled through selectively operable transmission gates for varying the voltage of a tuning capacitor to control a local oscillator for tuning independent of received signal. The local oscillator signal is mixed with a received signal to produce an intermediate frequency signal which is amplified in an IF amplifier. A frequency detector is coupled to the IF amplifier and produces an error signal dependent upon the frequency difference between a reference frequency and the IF signal. An additional current source and sink are coupled to the tuning capacitor through transmission gates controlled by the error signals. Differences greater than a predetermined amount selectively activate the latter transmission gates to provide substantially constant magnitude tuning voltage corrections irrespective of the amount of the difference.
REFERENCES:
patent: 3538450 (1970-11-01), Andrea et al.
patent: 3697885 (1972-10-01), Avins
patent: 3701039 (1972-10-01), Lang
patent: 3753172 (1973-08-01), Sakamoto
patent: 3784917 (1974-01-01), Kenyon
patent: 3806827 (1974-04-01), Standke
patent: 3869674 (1975-03-01), Borbely
Camasto Nicholas A.
Downey Joseph T.
Kominski John
Zenith Radio Corporation
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