Fast settling phase locked loop

Details Fast settling phase locked loop Fast settling phase locked loop

1993-03-29

1994-08-02

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331 14, 331 16, 331 17, H03L 708, H03L 7085, H03L 710, H03L 716

Patent

active

053349520

ABSTRACT:
A phase locked loop including a switch between a phase detector output and a VCO input to open the PLL during a frequency change is provided. While the PLL is open, an analog error correction signal is generated by sampling any residual error coming from the phase detector, and generating the analog error correction signal to counter the residual error. Once analog error correction signal is available, the switch is closed and the error correction signal is added to the phase detector output and the PLL is allowed to settle to an optimized frequency.

REFERENCES:
patent: 4105948 (1978-08-01), Wolkstein
patent: 4380742 (1983-04-01), Hart
patent: 4568888 (1986-02-01), Kimura et al.
patent: 4932074 (1990-06-01), McCormick, II
patent: 4937536 (1990-06-01), Reinhardt et al.
patent: 4980652 (1990-12-01), Tarusawa et al.
patent: 5128632 (1992-07-01), Erhart et al.
patent: 5130670 (1992-07-01), Jaffe
patent: 5175729 (1992-12-01), Borras et al.
Kuge, J. et al; "Fast Hopping Frequency Synthesizer with Small Frequency Error"; Proceedings IEEE ICWC; pp. 215-218; 1992 (no month).

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