8 An Output-Bandwidth-Optimized 200Gb/s PAM-4 100Gb/s NRZ Transmitter with 5-Tap FFE in 28nm CMOS

The ever-expanding demand for ultra-high-speed interconnects has driven the development of wireline TXs operating at >100Gb/s per lane [1]-[4]. This paper presents a PAM-4 TX achieving 200Gb/s with improved output bandwidth and output swing by minimizing the driver capacitance with pull-up current sources, multiplexing with flexible clock timing control, and employing a fully reconfigurable 5-tap FFE architecture.