Delay-compensated fractional-N frequency synthesizer

Details Delay-compensated fractional-N frequency synthesizer Delay-compensated fractional-N frequency synthesizer

2005-09-13

2005-09-13

Lee, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S156000, C331S016000, C331S017000

Reexamination Certificate

active

06943600

ABSTRACT:
A Phase-Locked Loop is provided that includes a main loop, a calibration loop, and Control Logic. The main loop comprises, coupled in series, a Phase Frequency Detector, a Main Charge Pump, a Main Loop Filter, a Voltage Controlled Oscillator and a Frequency Divider. The calibration loop is coupled to the Phase Frequency Detector and comprises a Calibration Charge Pump and a Calibration Loop Filter. The Control Logic controls the Frequency Divider and receives a control input signal. A Reference Frequency Signal is coupled to the Phase Frequency Detector and the Control Logic, and a calibration signal is coupled to the calibration loop. Additionally, the main loop further comprises a delay generator controlled by the Control Logic and arranged to receive correction signals from the calibration loop and to send an output signal to the Phase Frequency Detector.

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European Search Report dated May 14, 2003 for European Application No. 02-447268.0.

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