TIMING CONTROL FOR UNMATCHED SIGNAL RECEIVER

摘要

A device with an I/O interface includes a replica clock distribution path matched to a clock distribution path of an unmatched receiver circuit. The device can monitor changes in delay in the replica path, and adjust delay in the real clock distribution path in response to the delay changes detected in the replica path. The receiver circuit includes a data path and a clock distribution network in an unmatched configuration. A ring oscillator circuit includes a replica clock distribution network matched to the real clock distribution network. Thus, delay changes detected for the replica clock distribution network indicates a change in delay in the real clock distribution network, which can be compensated accordingly.

主权项

1. An apparatus comprising:
an unmatched receiver circuit, including
a data path including a first amplifier and a sampling circuit; anda clock distribution network coupled from a second amplifier to the sampling circuit to provide a strobe signal to the sampling circuit, where the second amplifier is not matched to the first amplifier; and a ring oscillator circuit, including
a third amplifier matched to the second amplifier;a counter to count oscillations for a period of time;a replica clock distribution network coupled from the third amplifier to the counter, where the replica clock distribution network is a replica of the clock distribution network of the unmatched receiver circuit; anda feedback path from the clock distribution circuit to the third amplifier.