Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1983-03-03
1984-10-30
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 4, 331178, H03B 2300, H03L 708
Patent
active
044802323
ABSTRACT:
The average frequency and sweep rate of a chirped oscillator are automatically digitally controlled for correction of long term drift. During each of successive swept-frequency chirps, the swept frequency output of a voltage-controlled oscillator is counted and the overflow time of the counter is utilized to control the average frequency. A second counter counts the chirp frequency in a first direction during a first preset period at the beginning of each chirp and counts the chirp frequency in a second and opposite direction during an identical preset period later in the chirp, to provide an underflow transition related to the slope of the chirped frequency signal. Digital circuitry for synthesis of the chirped oscillator frequency ramp signal, and for correction of the average frequency and slope thereof responsive to the first and second counter transitions, is utilized.
REFERENCES:
patent: 3495195 (1970-02-01), Ribour
patent: 3519955 (1970-07-01), Mead, Jr.
patent: 4129832 (1978-12-01), Neal et al.
patent: 4210776 (1980-07-01), Van Meter
Baker Lewin T.
Orlowski, Jr. Eugene J.
Davis Jr. James C.
General Electric Company
Krauss Geoffrey H.
LaRoche Eugene R.
Pascal Robert J.
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