A 20Gbps 1.2GHz Full-Duplex integrated AFE in 28nm CMOS for copper access
11 September 2017
A 28nm CMOS 1.2GHz full-duplex analog front end (AFE) is presented. The AFE can deliver 20Gbps of symmetric service across 50m of RG6 coax. The on-chip line driver, powered from a 7.2V supply and using core transistors, delivers 5.9Vptp differential to the line through the hybrid. A tunable capacitive hybrid circuit is proposed for low noise performance and allows channel matching. A cancellation of 23.1dB on average is achieved across the full band. A 3-stage receiver with input over-voltage protection is capable of driving 50Oh differential loads. The chip occupies 0.2817mm² of active area and consumes 1.53W.
