Method and apparatus for improving ringback tolerance in an input receiver

摘要

An embodiment of a ringback tolerant input buffer in a receiving device is disclosed. The input buffer includes circuitry to provide positive feedback to an input signal once the input signal has crossed a reference voltage threshold. The positive feedback prevents the input signal from recrossing the reference voltage threshold until the receiving device has sampled the input signal. The positive feedback is applied only until the input signal is sampled into the receiving device.