Hybrid analog/digital phase lock loop frequency synthesizer

Details Hybrid analog/digital phase lock loop frequency synthesizer Hybrid analog/digital phase lock loop frequency synthesizer

2006-08-01

2006-08-01

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

C331S00100A, C331S017000, C331S025000, C331SDIG002, C327S156000, C327S157000, C327S159000

Reexamination Certificate

active

07084709

ABSTRACT:
A hybrid frequency synthesizer includes an analog phase lock loop (PLL), a PLL, and a control circuit to control an output oscillator. The control circuit combines a control signal from the analog PLL with a control signal from the digital PLL to form a composite control signal. The composite control signal is conditioned depending on a state of lock of the analog PLL and/or the digital PLL. The composite signal controls the phase and frequency of the output oscillator. The analog control signal and the digital PLL control signal may be given a percentage of over the hybrid frequency synthesizer depending on the state of lock of the PLL and/or the digital PLL. The composite control signal provides both rapid, accurate, and robust acquisition by the digital PLL, and a smooth transition thereafter to low noise phase lock by the analog PLL.

REFERENCES:
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patent: 6028460 (2000-02-01), McCollum et al.
patent: 6657464 (2003-12-01), Balardeta et al.
U.S. Appl. No. 11/039,113, Colin Wai Mun Leong, Method and Apparatus for a Hybrid Phase Lock Loop Frequency Synthesizer, filed Jan. 18, 2005.

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