Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Patent
1983-02-18
1985-05-07
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
331 12, 331 16, 331 25, H03L 700
Patent
active
045160848
ABSTRACT:
A frequency synthesizer for controlling the frequency f.sub.0 of a signal e.sub.0 in response to a control signal e.sub.c2 to produce a band of selectable frequencies separated by .DELTA.f between the frequencies f.sub.x and f.sub.y, where (f.sub.x +R.DELTA.f)=f.sub.0 and R is zero or any integer .ltoreq.(f.sub.y -f.sub.x)/.DELTA.f. The invention includes a first generator for generating the signal e.sub.0, a second generator for generating a signal e.sub.1 having a band of selectable frequencies separated by .delta.f, where .delta.f>>.DELTA.f, a frequency subtractor for subtracting f.sub.1 from f.sub.0 to produce a signal e.sub.2 of frequency f.sub.2. Also provided is a third generator for generating a variable preliminary reference signal of frequency f.sub.pr consisting of a band of selectable frequencies separated by M.DELTA.f and lying within the frequency band Mf.sub.x to Mf.sub.y, where (Mf.sub.x +R.multidot.M.DELTA.f)=Mf.sub.r2 ; a divider for dividing Mf.sub.r2 by M to produce a band of signal frequencies (f.sub.x +R.DELTA.f)=f.sub.r2 ; and a comparator for comparing f.sub.2 with f.sub.r2 to produce the control signal e.sub.c2.
REFERENCES:
patent: 4039806 (1977-08-01), Fredriksson et al.
patent: 4114110 (1978-09-01), Nossen
patent: 4192007 (1980-03-01), Becker
patent: 4283768 (1981-08-01), Scott
patent: 4301415 (1981-11-01), McFayden
patent: 4388597 (1983-06-01), Bickley et al.
"Frequency Synthesis by Phase Lock", William F. Egan, 1981, Wiley of New York, pp. 75-77.
LaRoche Eugene R.
Maginniss Christopher Lyle
Pascal Robert J.
RCA Corporation
Tripoli Joseph S.
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