Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

2008-04-24

2010-06-08

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S147000, C327S151000, C327S156000, C327S157000, C327S160000

Reexamination Certificate

active

07733136

ABSTRACT:
A frequency synthesizer includes: a fractional-N synthesizer configured to provide, in a locked condition, an output signal with an output frequency based on an input signal with a reference frequency, the fractional-N synthesizer including a charge pump outputting a current to be calibrated; a lock detector coupled to the fractional-N synthesizer to detect the locked condition, the lock detector being configured to send a first signal indicating the detection; a calibration component coupled to the lock detector and the fractional-N synthesizer, the calibration component being configured to provide a second signal to calibrate the current after receiving the first signal, based on a voltage sampled from the fractional-N synthesizer; and a current source array coupled to the calibration component and the fractional N synthesizer, the current source array being configured to calibrate the current based on the second signal.

REFERENCES:
patent: 6940356 (2005-09-01), McDonald et al.
patent: 6998891 (2006-02-01), Hsu et al.
patent: 7082176 (2006-07-01), Chien et al.

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