Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1974-09-25
1976-09-21
Kominski, John
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
325346, 325349, 325421, 331 8, 331 18, H04B 116
Patent
active
039821986
ABSTRACT:
An oscillator suitable for use as a local oscillator of high frequency apparatus comprises a voltage controlled oscillator, a reference oscillator, a phase detector for detecting the phase difference between the oscillation frequencies of the voltage controlled oscillator and the reference oscillator, means for filtering the output of the phase detector to produce a DC voltage and a phase synchronizing loop for feeding back the DC output of the low-pass filter means to the voltage controlled oscillator. Depending upon whether the oscillation frequency of the reference oscillator is maintained at a duty cycle of 50% or at a value other than 50%, the oscillation frequency of the voltage controlled oscillator is synchronized with an odd multiple or an integer multiple of the oscillation frequency of the reference oscillator when the oscillation frequency of the voltage controlled oscillator is varied forcibly.
REFERENCES:
patent: 2521058 (1950-09-01), Goldberg
patent: 2617040 (1952-11-01), Bailey
patent: 3080533 (1963-03-01), Edwards
patent: 3130376 (1964-04-01), Ross
patent: 3204197 (1965-08-01), Marzan
patent: 3249886 (1966-05-01), Anderson et al.
patent: 3484706 (1969-12-01), Saalborn
patent: 3821470 (1974-06-01), Merrell
patent: 3821658 (1974-06-01), Hoeft
IEEE Transactions on Broadcast & Television Receivers, Nov. 1970, pp. 281-288.
Kumagai Morio
Naito Michinori
Numata Yukio
Saikaishi Noboru
Takahashi Tetsuo
Kominski John
Pfund Charles E.
Trio Electronics Incorporated
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