Digital phase-locked loop with pulse controlled charge pump

Details Digital phase-locked loop with pulse controlled charge pump Digital phase-locked loop with pulse controlled charge pump

1998-11-09

2000-10-31

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327 7, 327141, 327147, 327150, 327151, 327 5, 331 25, H03L 706

Patent

active

061408522

ABSTRACT:
A digital phase locked loop includes a digital phase detector which provides a magnitude control signal to adjust the step size of up and down adjustments in the phase/frequency of a digitally controlled oscillator, resulting in shorter lock-in or acquisition time and smaller jitter as compared to conventional digital phase locked loop devices. In the disclosed embodiments, the digital phase detector includes multiple bit shift registers in both the up and down directions to count or measure a number of up or down minimum width pulses and provide a pulse magnitude control based on the value of the shift registers to the digitally controlled oscillator. The digitally controlled oscillator includes a charge pump and voltage controlled oscillator. In one embodiment, the charge pump provides programmable control over its output current pulses to a capacitor which controls the output frequency of the voltage controlled oscillator.

REFERENCES:
patent: 5241567 (1993-08-01), Shimakata
patent: 5493243 (1996-02-01), Ghoshal

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