Patent ID: 7622908
Filing Date: 2009-11-24
Classification: G01R,G11C

Abstract:
1. A system for determining the relative timing between first and second digital signals, comprising: a multi-phase signal generator receiving the first digital signal, the multi-phase signal generator comprising a delay circuit receiving the first digital signal and being structured to delay the first digital signal to produce a delayed signal that is delayed from the first digital signal by a first delay time, the multi-phase signal generator further comprising a plurality of phase mixers receiving the first digital signal and the delayed signal, the phase mixers being structured to generate respective multi-phase signals that are delayed by respective percentages of the first delay time; and a plurality of phase detectors each of which is coupled to receive the second digital signal and a respective one of the multi-phase signals from the multi-phase signal generator, each of the phase detectors being structured to generate an output signal having a logic level corresponding to the logic level of one of the second digital signal and the respective multi-phase signal at a predetermined transition of the other of the second digital signal and the respective multi-phase signals.