Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Patent
1977-06-10
1978-07-04
Kominski, John
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
328155, 331 1A, 331179, H03B 308
Patent
active
040991377
ABSTRACT:
A digitally controlled microwave phase lock loop for switching rapidly from one lock frequency to another is disclosed. A digital word corresponding to a desired input voltage for a selected frequency is converted to an analog voltage for application to the coarse tuning port of the loop's voltage controlled oscillator. Prior to switching to another frequency, the error voltage for the fine tuning port is compared with a zero error reference voltage. The least significant bit of the digital word for such frequency is increased or decreased by one depending on the direction difference between the compared voltages. This incrementally changed word controls the coarse tuning voltage during the next selection of the particular frequency. The system is initialized by repetitively selecting each of the possible frequencies until the digital word for each selected frequency is within one increment of the zero error reference voltage for the fine tuning port.
REFERENCES:
patent: 3689849 (1972-09-01), Swanson et al.
Alm, Jr. Benjamin C.
Hopwood Francis W.
Jelen Robert A.
Muhlbaier John P.
Wright, Jr. Joseph F.
Kominski John
Patterson H. W.
Westinghouse Electric Corp.
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