Equalization and clock recovery for a 2.5-10Gb/s 2-PAM/4-PAM backplane transceiver cell

A backplane transceiver uses a folded 5-tap TX equalizer and 5-tap RX equalizer to counteract losses and reflections. A flexible 2-PAM/4-PAM CDR uses select transitions for receive clock recovery. BER better than 10/sup -15/ at 10 Gb/s and power <60 mW/Gb are measured values for a 16" backplane with two high speed connectors.