DYNAMIC DESKEW FOR BANG-BANG TIMING RECOVERY IN A COMMUNICATION SYSTEM

摘要

Described embodiments calibrate a sampling phase adjustment of a receiver. An analog-to-digital converter generates samples of a received signal at a sample phase. A phase detector selects a window of n samples. If the window includes a Nyquist pattern, a bang-bang trap is enabled. The bang-bang trap iteratively, for each transition between a first consecutive bit and a second consecutive bit in the Nyquist pattern, samples the received signal at a zero crossing between the first and second consecutive bits and determines the transition polarity. Based on the transition polarity and the zero crossing sample value, the bang-bang trap determines whether the sample phase is correct. If Nyquist patterns are absent from the window, a margin phase detector determines a target voltage margin value and a voltage of a cursor bit of the window. Based on the target voltage margin value and the voltage of the cursor bit, the margin phase detector determines whether the sample phase is correct.