Adaptive cancellation of voltage offset in a communication system

摘要

Described embodiments include a receiver for a serial-deserializer or the like. The receiver has adaptive offset voltage compensation capability. The offset voltage is canceled by a controller in a feedback loop to generate a compensation signal depending on a data decision error signal or by timing signals used for clock recovery.

主权项

1. A receiver having an input, the receiver comprising:
an analog front end coupled to the receiver input and having an output; a first subtractor having a first input coupled to the output of the analog front end and having an output; a second subtractor having a first input coupled to the output of the first subtractor, a second input, and an output; a first slicer having an input coupled to the output of the second subtractor and having an output; a first sampler having an input coupled to the output of the second subtractor, having an output, and configured to sample signals applied thereto at transitions in those signals; an offset adaptation controller having an input coupled to the output of the first sampler and configured to produce at an output a signal coupled to a second input of the first subtractor; and a decision feedback equalizer having an output coupled to the second input of the second subtractor, at least one tap coefficient, and an input coupled to the output of the first slicer.