Patent ID: 6198321
Filing Date: 2001-03-06
Classification: H03L

Abstract:
A device for the generation of a drive signal phase-shifted with respect to an external synchronization signal, the device comprising:a first digital phase-locked loop to provide a reference signal which is servo-linked to the external synchronization signal and controlled by a present phase of N phases of a high frequency signal; anda second digital phase-locked loop receiving the reference signal from said first digital phase-locked loop and comprisinga measurement circuit to measure a position of an active edge of the drive signal with respect to an active edge of the reference signal, the measurement circuit comprising a rough measurement circuit for rough measurement of the position, controlled by a fixed phase of the high frequency signal independent of the present phase in the first digital phase-locked loop,a computing circuit to compute the phase shift in view of the fixed phase and the present phase, anda phase-shift circuit to shift the phase of the drive signal by the computed phase-shift.