Patent ID: 8774336
Filing Date: 2014-07-08
Classification: H03L,H04L

Abstract:
1. A CDR (Clock-and-Data Recovery) apparatus for low-power highly accurate multiphase clock generation by using polyphase filter, the CDR apparatus comprising: phase rotators configured to output arbitrary phases by taking a weighted average current dynamically wherein the phase rotators requiring multiphase clock signals; phase interpolators configured to output arbitrary phases by weighted average for current wherein a ratio of the weighted average for current is fixed; a 1st polyphase filter being connected to the phase rotators for making the multiphase clock signals to be sinusoidal; and a 2nd polyphase filter being connected between the phase rotators and the phase interpolators for delaying the multiphase clock signals, wherein the 2nd polyphase filter separates adjacent clock phases to be interpolated with identical weights.