Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1974-11-18
1976-05-25
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
328 42, 331 11, 331 17, 331 25, H03B 304
Patent
active
039597377
ABSTRACT:
A frequency synthesizer or portion thereof, that includes only one main phase-locked loop. The phase-lock loop includes a digital divider that can effectively divide in fractions, thus, permitting use of a higher reference frequency than normally required for the same degree of frequency resolution in integer divisor synthesizers. This, in turn, increases the short-term stability and reduces phase-noise. The fractional divider includes a secondary phase-lock loop that tends to introduce an unwanted ramp signal which causes spurious sidebands in the output signal. These spurious sidebands, when objectionable, are effectively suppressed by a circuit that generates a second ramp signal of similar frequency, duration and shape to the unwanted ramp signal but of opposite phase.
REFERENCES:
patent: 3286191 (1966-11-01), Cornwell
patent: 3441870 (1969-04-01), Wicker
patent: 3516007 (1970-06-01), Bos et al.
patent: 3611175 (1971-10-01), Boelke
patent: 3684976 (1972-08-01), Terreault
patent: 3805192 (1974-04-01), Ocnaschek et al.
patent: 3872397 (1975-03-01), Hanneman
Engelmann Microwave Co.
Grimm Siegfried H.
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