Oscillators – Relaxation oscillators
Patent
1976-01-21
1977-05-10
Griffin, Robert L.
Oscillators
Relaxation oscillators
325419, 325421, 325468, 331 1A, 331 76, H04B 116
Patent
active
040231089
ABSTRACT:
An electronically controllable tuning device includes a voltage controlled oscillator adapted to have an oscillation frequency controlled by a control voltage and simultaneously generate a fundamental wave of a predetermined frequency, a programmable frequency divider for dividing the fundamental wave frequency at a frequency division ratio corresponding to the control of a channel selection means and a phase locked loop adapted to compare the fundamental wave phase with the phase of the output of the programmable divider to generate a comparison output and feeding the comparison output back to the voltage controlled oscillator to control the output frequency of the voltage controlled oscillator. The tuning device further includes means for supplying as a local oscillation signal to an intermediate frequency generating mixer one of higher harmonic wave components of the fundamental wave.
REFERENCES:
patent: 3778716 (1973-12-01), Stokes
patent: 3864636 (1975-02-01), Fukuda et al.
patent: 3913020 (1975-10-01), Van Anrooy
IEEE Spectrum on "TV Receiver Tuning Systems of the Future", by Doyle et al., vol. 15, No. 2, July 1969, pp. 220-223.
Griffin Robert L.
Ng Jin F.
Tokyo Shibaura Electric Co. Ltd.
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