Tunable oscillator with high stability and accurate frequency

Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements

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331 17, H03B 304

Patent

active

041211707

ABSTRACT:
A tunable oscillator with high frequency stability and accuracy which utilizes a counter that periodically checks the actual value of the frequency and depending upon the count reached in the counter stage produces one of two logic output signals such that the first signal is formed on the occurrence of a number from a first correlated number sequence which indicates a frequency deviation from the desired value in a first direction and the second number is formed on the occurrence of a number which deviates from the desired frequency in a second direction and wherein logic signals are used to directly or indirectly recharge a capacitor at varying time constants depending upon the frequence drift.

REFERENCES:
patent: 3514713 (1970-05-01), Leyde
patent: 3872396 (1975-03-01), Bastide et al.

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