Patent ID: 8085880
Filing Date: 2011-12-27
Classification: H04L

Abstract:
1. A method of detecting an input signal on an input port of a receiver, the method comprising: sampling a signal parameter at a first sampler coupled to the input port at each of a number of first sample instants during a time interval covering multiple clock cycles of a recovered clock signal; sampling the signal parameter at a second sampler coupled to the input port at each of a number of second sample instants during the time interval according to a scan clock signal, one of the second sample instants corresponding to each first sample instant, such that when the first and second sample instants are viewed as a sequence, the second sample instants occur progressively offset in time when compared to the corresponding first sample instants; and indicating presence of the input signal when the signal parameter sampled by the second sampler exceeds a threshold for at least a predetermined number of second sample instants.