Patent ID: 7136429

Claim:
A digital signal receiver, comprising: a passive coupling structure having a signal input, a low frequency component output, and a high frequency component output; a level based receiver having a first input connected to said low frequency component output and a first output; a first comparator having a first comparator output and also having a first first comparator input connected said high frequency component output and a second first comparator input connected to a first reference voltage; a second comparator having a second comparator output and also having a first second comparator input connected to said high frequency component output and a second second comparator input connected to a second reference voltage and wherein said high frequency component output is biased to a DC voltage level that is between said first and said second reference voltage; and, a state machine, receiving said first and second comparator outputs and said first output, that changes a receiver output when said first output and at least one of said first and second comparator outputs transition in at least one direction.