Patent ID: 7764093
Filing Date: 2010-07-27
Classification: H03L

Abstract:
1. Voltage shift control circuit intended to be placed in parallel with at least one voltage shift capacitor having a first terminal connected to an output of the phase comparator and a second terminal connected to an input of the voltage controlled oscillator of a phase locked loop and comprising: an input, intended to be coupled with the output of the phase comparator; an output, intended to be coupled with the input of the voltage controlled oscillator; controlled charging means, designed to charge the voltage shift capacitor according to a control signal; controlled pre-charging means, designed to accelerate the charging of the voltage shift capacitor by the controlled charging means; and controlled electrical polarization means, designed to ensure the electrical polarization of the input during the pre-charging of the voltage shift capacitor, wherein the charging means includes a first operational amplifier and the polarization means includes a second operational amplifier.