Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1985-07-17
1987-05-26
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
307516, 328134, 328151, 328155, 331 8, 331 14, 331 17, 331 27, H03L 718
Patent
active
046689222
ABSTRACT:
A phase-locked frequency synthesizer (10) having a voltage controlled oscillator (40), a divider circuit (60), and a sample-and-hold phase detector (30, 80, 90, 100, 110) which utilizes gain compensation (90,110) for optimizing phase-locking speed. The sample-and-hold circuit (FIG. 6) also includes circuitry for substantially reducing perturbations at its output. The frequency synthesizer further includes control circuitry (70) and a reference frequency generator (20) for quickly reinitializing the synthesizer in response to a command to change frequency.
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Crawford James A.
Frey Gary D.
Grimm Siegfried H.
Hughes Aircraft Company
Karambelas Anthony W.
Runk Thomas A.
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