A Low BER DB-PAM4 Adaptive Equalizer For Large Channel Loss In Wireline Receiver

In order to solve the problem of large channel loss and high bit error rate in high-speed signal transmission of wireline receiver, an adaptive equalizer suitable for 112 Gb/s DBPAM4 is designed in this paper. In order to avoid the problem that the equalization capability of the adaptive equalizer is limited after the PAM4 signal undergoes large channel loss, this paper designs the DB-PAM4 encoding based on the dou-binary encoding technology of NRZ, which improves the equalization capability of the receiver, The DB-PAM4 signal replaces the PAM4 signal, reducing the signal transmission bandwidth. In order to solve the problems of complex adjustment and low equalization accuracy in traditional adaptive equalization, a twostep equalization method is adopted for adjustmen. First, use the conversion process of NRZ signal to Doubinary signal to generate a data path with duobinary characteristics, then send the prepam4 signal to adjust the tap coefficient of the DSP. This paper uses Cadence’s AMS simulation platform to verify the receive equalizer of DB-PAM4. Simulation results show: When 112Gb/s pre-PAM4 signal passes through 35dB@28GHz channel, receiver(RX) utilizes adaptive equalizer to generate 112Gb/s DBPAM4 signal, and the receiver bit error rate (BER) is less than 3e-9.