A QDR-Based 6-GB/s Parallel Transceiver With Current-Regulated Voltage-Mode Output Driver and Byte CDR for Memory Interface

This brief presents an 8-bit parallel transceiver for low-power memory interface with a current-regulated voltage-mode driver and a clock and data recovery performing both bit recovery and byte alignment. Sharing a current source by output drivers enables voltage swing control without any regulator circuit while holding the benefits of low-power voltage-mode driving. In the receiver, with only one phase rotator in a globally shared phase-locked loop, a narrow-range delay line in each deskewing phase recovery loop effectively performs seamless phase adjustment. The transceiver, implemented in a 90-nm CMOS, shows a data rate of 6 Gbit/s/ch with a bit error rate of 10^-12 and a power consumption of 2.8 mW/Gbit/s.