A Single Chip 160 Mbit/s Cable Communication Circuit Including a Gain Controlled Equalizer and a Data Regenerating PFLL

Abstract

In this paper a single chip transmitter and receiver interface circuit for 160 Mbit/s CMI-coded data transmission is presented. The receiver circuit includes a 12 dB cable equalizer to compensate for nonconstant cable attenuations. There is also a PFLL for data regeneration and to extract a 320 MHz oscillator clock signal. The frequency characteristics of the equalizer are controlled with an automatic gain control loop (AGC). The PFLL is a combination of two separate control loops, the purpose of which is to keep the integrated oscillator on the narrow locking range of the data loop. The frequency loop has been designed with a frequency detector to avoid interferences between the two control loops. The transmitter includes a cable driver supplying a stable 1 Vpp signal amplitude to the transmission line and also a PLL to extract a 320 MHz clock signal.