Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1981-11-30
1984-08-07
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 14, 331 22, 331 25, H03L 718
Patent
active
044646380
ABSTRACT:
An improvement in a digital frequency synthesizer comprising a voltage-controlled oscillator (VCO) for producing a signal S.sub.VCO having a frequency f.sub.VCO, a first signal generator for generating a plurality of signals S.sub.AS having a spectrum of frequencies f.sub.AS, all exceeding a given minimum frequency f.sub.M, a mixer responsive to S.sub.VCO and to S.sub.AS to produce an output signal having a frequency (f.sub.VCO .+-.f.sub.AS), a divide-by-N divider responsive to (f.sub.VCO .+-.f.sub.AS) to produce a signal S.sub.N having a frequency f.sub.N, a second signal generator for generating a first reference signal S.sub.R1 having a frequency f.sub.R1, a phase detector responsive to S.sub.N and S.sub.R1 to produce a d.c. control signal E.sub.c whose amplitude varies with the phase relation of S.sub.N and S.sub.R1, and a filter for supplying E.sub.c back to said VCO, the VCO being responsive to E.sub.c to produce an output signal S.sub.VCO of frequency f.sub.VCO where (f.sub.VCO .+-.f.sub.AS )=Nf.sub.R1, an improvement for generating signals in the frequency range Nf.sub.R1 .+-.f.sub.M and comprising a third signal generator for generating a second reference signal S.sub.R2 having a frequency f.sub.R2 where (Nf.sub.R2 +f.sub.M).ltoreq.(Nf.sub.R1 -f.sub.M). Also provided is logic responsive to system frequency requirements that the VCO generate a signal having a frequency between (Nf.sub.R1 .+-.f.sub.M) to supply S.sub.R2 to the phase detector in lieu of S.sub.R1.
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Crowley Albert T.
Lisowski Robert M.
Grimm Siegfried H.
Mis David C.
Phillion D. W.
RCA Corporation
Tripoli J. S.
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