Patent ID: 8149038
Filing Date: 2012-04-03
Classification: H03K,H03L

Abstract:
1. A dynamic phase alignment circuit comprising: a phase generator circuit comprising delay-locked loop circuits operable to generate periodic output signals, wherein each of the delay-locked loop circuits is operable to generate one of the periodic output signals in response to at least two periodic input signals; a multiplexer circuit operable to provide a selected periodic signal from among the periodic input signals and the periodic output signals based on select signals; a phase detection circuit operable to compare a phase of the selected periodic signal to a data signal to generate a phase detection signal; and a first control logic circuit operable to generate the select signals, wherein the first control logic circuit is operable to adjust the select signals based on changes in the phase detection signal to cause the multiplexer circuit to adjust the phase of the selected periodic signal, wherein each of the delay-locked loop circuits comprises a shift register operable to cause a delay provided to a first delayed signal to vary based on a phase comparison between the first delayed signal and a first one of the periodic input signals, and wherein a second one of the periodic input signals is delayed to generate the first delayed signal.