Patent ID: 6472914
Filing Date: 2002-10-29
Classification: H03L

Abstract:
A charge pump for a self-biasing phase-locked loop and a self-biasing delay-locked loop, the charge pump having an output, a pair of inputs for an up and a down output from a phase and frequency detector and a pair of inputs for at least two bias voltage outputs from a bias generator, comprising;a p-type charge pump coupled to the up output of the phase and frequency detector and a first bias voltage output from the bias generator circuit; a n-type charge pump coupled to the p-type charge pump, the n-type charge pump having inputs coupled to the down output of the phase and frequency detector and a second bias voltage output from the bias generator circuit, the bias generator circuit is coupled to the output of the charge pump and coupled to provide feedback to the charge pump; and a first capacitor coupled across the p-type charge pump, the voltage across the first capacitor provides the output for the charge pump.