Oscillators – Relaxation oscillators
Patent
1977-02-11
1979-07-17
Griffin, Robert L.
Oscillators
Relaxation oscillators
325452, 325418, 331 1A, H04B 106, H04B 116, H03B 304
Patent
active
041616987
ABSTRACT:
A fine tuning circuit for a superheterodyne receiver including an oscillator whose output frequency is automatically regulated to the value of the rated frequency when the frequency of the oscillator deviates from the rated tuning frequency assigned the receiving channel by means of a control arrangement including a counter for periodically producing a count representative of the oscillator output frequency in a manner such that successive counting states of the counter correspond to oscillator frequency differences which are smaller than the frequency differences between adjacent rated tuning frequency values and with selected counting states being associated with the rated tuning frequency values, and a signal generating arrangement for deriving the control voltage from the counting state of the counter. The counter provides its count in a coded form and the signal generating arrangement is responsive to only part of the counter states which appear when there are deviations from the rated frequency to generate the control voltage.
REFERENCES:
patent: 3488605 (1970-01-01), Schwartz
patent: 3641434 (1972-02-01), Yates et al.
patent: 3918006 (1975-11-01), Munninghoff et al.
patent: 3942121 (1976-03-01), Bell et al.
patent: 3949296 (1976-04-01), McClaskey et al.
patent: 3980951 (1976-09-01), Breeze et al.
patent: 4121162 (1978-10-01), Alberkrack et al.
Introduction to Switching Theory & Logic Design, by Hill & Peterson, Wiley & Sons, .COPYRGT. 1968, p. 111.
Designing with TTL Integrated Circuits, Morris & Miller, McGraw-Hill, .COPYRGT. 1971, pp. 258-259.
NTZ, 1972, vol. 25, No. 11, pp. 507 and 508.
Griffin Robert L.
Licentia, Patent-Verwaltungs-G.m.b.H.
Psitos Aristotelis M.
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