Hybrid analog-digital phase lock loop multi-frequency synthesize

Details Hybrid analog-digital phase lock loop multi-frequency synthesize Hybrid analog-digital phase lock loop multi-frequency synthesize

1998-06-08

2000-02-22

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327156, 327159, 331 11, H03L 7087

Patent

active

060284609

ABSTRACT:
A hybrid multi-frequency synthesizer is comprised of an analog phase lock loop, a digital phase lock loop and a phase lock loop monitor. The digital phase lock loop provides an accelerated, accurate frequency acquisition mode for the synthesizer. The analog phase lock loop provides a robust operating mode after frequency acquisition is achieved. The phase lock loop monitor provides a control circuit that monitors the synthesizer for frequency and phase perturbations. The phase lock loop monitor controls an electronic switch that selects either the analog or digital phase lock loop. The invention is further characterized by programmable band pass filtering, peak sensitivity detection and a fast lock feature.

REFERENCES:
patent: 5739727 (1998-04-01), Lofter et al.

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