Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1990-04-30
1991-10-08
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
307516, 328134, 331 25, 331 27, 455 76, 455119, H03L 718
Patent
active
050558005
ABSTRACT:
A frequency synthesizer having a frequency divider and a frequency multiplier in the feedback loop is disclosed. The minimum frequency separation between two adjacent synthesized channels is equal to the reference frequency divided by the multiplication ratio of the multiplier. The division ratio of the frequency divider, which can be analyzed as the sum of an integer and a fractional portion, is varied with time by a digital sequence, resulting in a minimum frequency increment equal to a fraction of the reference frequency. The multiplier acts to reduce the nonlinearities of the frequency synthesizer when the fractional portion of the division ratio causes a large variation in the instantaneous division ratio by reducing the effective division ratio of the loop.
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Brewerton et al., "Defining the Elements of Good Design", Microwaves & RF, Jun. 1984, pp. 79, 81, 83, 85, 124.
Black Gregory
Hietala Alexander W.
Grimm Siegfried H.
Hackbart Rolland R.
Jenski Raymond A.
Motorola Inc.
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