An adaptive cable equalizer for serial digital video rates to 400 Mb/s

A monolithic adaptive cable equalizer incorporates an analog adaptive equalizing filter that accurately synthesizes the inverse transfer function of cables ranging in length from Om to lengths that attenuate the signal by 40 dB at 200 MHz. This corresponds to 300 m of Belden 8281 cable or roughly 120 m of CAT5 UTP cable. The equalizer supports data rates extending beyond 400 MWs, and automatically compensates for different cable lengths as well as process and temperature variations. The measured peak-to-peak jitter after equalizing data is transmitted through 200 m of Belden 8281 cable at 270 Mb/s is less than 200 ps. This surpasses the performance of any monolithic serial digital video equalizer reported.