Self-adjusting startup control for charge pump current source in

Details Self-adjusting startup control for charge pump current source in Self-adjusting startup control for charge pump current source in

1998-03-16

1999-08-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 25, H03L 7093

Patent

active

059399490

ABSTRACT:
A circuit and a method are provided for reducing power consumption in a phase-locked loop (PLL) by controlling how long the bias current for the charge pump is turned on. In such a circuit, a bias check circuit that indicates when the bias current has stabilized, and a self-adjusting control circuit including an internal counter are provided to measure how long the bias current takes to start up when the PLL is locked. Then the self-adjusting control circuit prevents the bias current from turning on until there is just enough time for it to stabilize before a charge pump event. A default control circuit is also provided to turn the bias current on for specified intervals when the PLL is out of lock.

REFERENCES:
patent: 5764108 (1998-06-01), Rose et al.
patent: 5783972 (1998-07-01), Nishikawa
patent: 5847614 (1998-12-01), Gilbert et al.

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