Common-mode noise detection and calibration system for high-speed SERDES

Abstract

A SERDES includes a transmitter configured to output a differential signal that is subject to common-mode noise, where the differential signal includes a digital signal and an inverted digital signal. The detector circuitry is configured to derive an amplified and biased common-mode signal from the differential signal, and the transmitter is further configured to tune the digital signal responsively to feedback based on the amplified and biased common-mode signal to reduce electromagnetic interference of the common-mode noise. Such a SERDES may include feedback circuitry which configured to receive the amplified and biased common-mode signal and to convert the amplified and biased common-mode signal into a feedback signal, and the transmitter may be further configured to receive the feedback signal for tuning the digital signal based on the feedback signal.

Dependencies are inferred from the claim text.