Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1980-07-14
1982-06-22
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 12, 331 16, 331 17, 331 25, H03L 700, H03L 718, H03L 722
Patent
active
043365051
ABSTRACT:
A low phase noise signal source is disclosed which incorporates a voltage controlled oscillator (VCO) and a feedback network that, in effect, demodulates the VCO output signal and supplies negative feedback representative of the VCO signal noise to the VCO frequency control terminal. The feedback network includes a frequency discriminator of the type wherein a time delay network is connected to one input port of a phase detector, with the VCO output signal being supplied to the time delay network and the second input port of the phase detector. A variable phase shifter, responsive to the signal supplied by the phase detector, is included in one of the phase detector input paths to cause a zero crossover of the frequency discriminator transfer characteristic to occur at the frequency to which the VCO is tuned. By establishing predetermined relationships between the transmission poles and zeroes of the feedback network, normal VCO tuning characteristics are preserved while simultaneously decreasing VCO phase noise. Various arrangements for operating the signal source over a wide band of output frequencies are disclosed, including a low-noise phase-locked loop frequency synthesizer.
REFERENCES:
patent: 3614649 (1971-10-01), Gerig
patent: 3882413 (1975-05-01), Healey
patent: 4048580 (1977-09-01), Campbell et al.
Grimm Siegfried H.
John Fluke Mfg. Co. Inc.
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