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US 4,070,635 AGranted
Delay line oscillator with phase locked loop for reducing phase fluctuations
AssigneeWestinghouse Electric Corp.
InventorDaniel J. Healey, III
Life of this patent
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Abstract
A phase locked oscillator provides an agile frequency signal source with low phase fluctuations for use in radar and communications systems wherein the phase fluctuations of a predetermined input signal are reduced by the phase locked oscillator by modulating the phase of a delayed feedback signal in response to the phase difference between the input signal and the output signal.
Claims21
A method for generating a frequency signal with low phase fluctuations comprising the steps of:
- a. generating an input signal with low phase fluctuations;
- b. generating an output signal in accordance with a first portion of said input signal and a second feedback signal coupled together;
- c. generating a delayed feedback signal derived from said output signal, said delayed feedback signal having the same frequency as said output signal;
- d. generating a first signal indicative of the phase difference between a second portion of said input signal, and said output signal;
- and
- e. modulating the phase of said delayed feedback signal in accordance with said first signal to generate said second feedback signal
- whereby the phase fluctuations of said output signal are substantially reduced due to the presence of said second feedback signal.
4 more elements
Electronic apparatus for generating a low phase noise frequency output signal comprising:
- first amplifier means for generating an output signal in accordance with an input signal having low phase fluctuations and a second feedback signal coupled together;
- second means for generating a delayed feedback signal derived from said output signal, said delayed feedback signal having the same frequency as said output signal;
- and
- third means coupled to said first amplifier means for generating a first signal indicative of the phase difference between said input and output signals;
- and means for phase modulating said delayed feedback signal in accordance with said first signal to generate said second feedback signal
- whereby the phase fluctuations of said output signal are substantially reduced due to the presence of said second feedback signal.
3 more elements
Dependencies are inferred from the claim text.