关键词: 光通信；前馈均衡器；判决反馈均衡器；最小均方差

Abstract: A design of equalizer at front-end of high speed transceiver for both backplane and optical digital communications is proposed. Due to dispersion effect, a feed forward equalization (FFE) combines with decision feedback equalizer (DFE) is used instead of the combination of continuous time linear equalizer (CTLE) and DFE, which is frequently-used in backplane communications. System uses 3 pre-tap, 3 post-tap and 1 main tap to balance pre-cursor and post-cursor distortion with 15 dB equalization capability. Full adaptive algorithm is used to calibrate system, and analog least mean square error (LMS) for FFE, 1/16 data rate sign-sign LMS for DFE. The chip is made by 28 nm CMOS process, and input frequency is up to 10 Gbit/s.

Key words: optical communication; feed forward equalization; decision feedback equalizer; least mean square error