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Modern broadband communication systems require high-speed receivers to process serial data at tens of gigabits per second. As the data rate reaches 40Gb/s, skin-effect and dielectric loss in the transmission medium cause significant loss at high frequencies, leading to considerable ISI even if the data is transmitted over a short copper cable. To reduce the ISI and improve the BER, extensive equalization...
This paper presents a 40 Gb/s serial-link receiver including an adaptive equalizer and a CDR circuit. A parallel-path equalizing filter is used to compensate the high-frequency loss in copper cables. The adaptation is performed by only varying the gain in the high-pass path, which allows a single loop for proper control and completely removes the RC filters used for separately extracting the high-...
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