A high speed transmitter with 40 bits data and variable data-width and supported multi-protocols

This paper propose a system of transmitter(TX) supported multi-protocols and variable data-width, with max input data width of 40bits and data rate of 10.312 5 Gbps. The transmitter consists of Normalization of Data Width(NMDW), 40:1MUXs, distributed clock circuit and 3-taps Feed-Forward-Equalizer(FFE). This paper is proposed an improved 40:1MUXs circuit. and supported in SMIC 40nm CMOS technology, supported by 1.1 V. The power consumption of TX is 34.5mW@10.312 5 Gbps. The differential eye diagram is larger than 800 mV before channel. Meanwhile, TX is supported 4 different protocols, 7 different data-rate, 9 work conditions, the work temperature ranged from -45℃to 125℃.