Title :
A novel mixed-mode adaptive equalization system for high-speed 2-level PAM signals
Author :
Tam, Derek H S ; Ng, Wai Tung
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Abstract :
A novel mixed-mode adaptive equalization system for a high-speed 2-level pulse-amplitude nodulated (PAM) signal is presented. The intended application is in the area of digital serial interface, such as a non-return-to-zero-inverted (NRZI) serial video signal with a data rate of 270 Mbits/s. The adaptive system tunes the zeros of a finite-impulse-response (FIR) analog programmable filter. Programmable differentiators and transconductors are designed to increase the tuning range of the filter. An average error, obtained by calculating the accumulated area of the eye-diagram, and average gradients are proposed as inputs to a digital least-mean-squared (LMS) algorithm. This approach allows a more relaxed speed requirement for analog-to-digital converters (ADCs). A third-order analog filter, along with some essential circuit blocks, are designed for a 0.35 μm CMOS process
Keywords :
CMOS integrated circuits; FIR filters; adaptive equalisers; differentiating circuits; least mean squares methods; mixed analogue-digital integrated circuits; programmable filters; pulse amplitude modulation; video signal processing; 0.35 micron; 270 Mbit/s; CMOS process; accumulated area; analog-to-digital converters; average gradients; digital least-mean-squared algorithm; digital serial interface; finite-impulse-response analog programmable filter; high-speed two-level PAM signals; mixed-mode adaptive equalization system; non-return-to-zero-inverted serial video signal; programmable differentiators; programmable transconductors; tuning range; Adaptive control; Adaptive equalizers; Adaptive filters; Adaptive systems; Circuits; Finite impulse response filter; Least squares approximation; Programmable control; Pulse modulation; Signal generators;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.858860
