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We present the design principle and test results of a data transmitting ASIC,GBS20, for particle physics experiments. The goal of GBS20 will be an ASIC thatemploys two serializers each from the 10.24 Gbps lpGBT SerDes, sharing the PLLalso from lpGBT. A PAM4 encoder plus a VCSEL driver will be implemented in thesame die to use the same clock system, eliminating the need of CDRs in the PAM4encoder. This way the transmitter module, GBT20, developed using the GBS20ASIC, will have the exact lpGBT data interface and transmission protocol, withan output up to 20.48 Gbps over one fiber. With PAM4 embedded FPGAs at thereceiving end, GBT20 will halve the fibers needed in a system and better usethe input bandwidth of the FPGA. A prototype, GBS20v0 is fabricated using acommercial 65 nm CMOS technology. This prototype has two serializers and a PAM4encoder sharing the lpGBT PLL, but no user data input. An internal PRBSgenerator provides data to the serializers. GBS20v0 is tested barely up to20.48 Gbps. With lessons learned from this prototype, we are designing thesecond prototype, GBS20v1, that will have 16 user data input channels each at1.28 Gbps. We present the design concept of the GBS20 ASIC and the GBT20module, the preliminary test results, and lessons learned from GBS20v0 and thedesign of GBS20v1 which will be not only a test chip but also a user chip with16 input data channels.

A 20 Gbps Data Transmitting ASIC with PAM4 for Particle Physics Experiments