A high speed low-noise equalization technique with improved bit error rate

This paper presents a low-noise adaptive equalization technique suitable for Gbps data transmission. The proposed equalization technique uses adaptive analog FIR filter as the equalization filter for high-speed operation. The FIR filter is trained with a random search algorithm on an error signal calculated by comparing the spectral energy of the equalized signal with the desired spectral energy. The proposed error detection scheme includes the comparator as an integrated part of the equalizer to avoid over-boosting the high frequency noise, thus it has less high-frequency noise amplification than typical equalizers. Bit error rate analysis comparing the noise performance of the proposed equalization method with typical equalization methods is presented; simulation shows that the proposed method has much improved bit error rate performance at the same noise level. The high-frequency noise amplification of the proposed equalization method is 27.38 dB lower than typical method for 125 Mbps data transmission over 200 m UTP5 cables.

[1]  David A. Johns,et al.  Integrated circuits for data transmission over twisted-pair channels , 1997 .

[2]  Anthony N. Mucciardi,et al.  Self-Organizing Probability State Variable Parameter Search Algorithms for Systems that Must Avoid High-Penalty Operating Regions , 1974, IEEE Trans. Syst. Man Cybern..

[3]  M.H. Shakiba.  A 2.5 Gb/s adaptive cable equalizer , 1999, 1999 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC. First Edition (Cat. No.99CH36278).

[4]  Walter Y. Chen.  A direct equalization method , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[5]  K. Hirotsu,et al.  An analog neural network chip with random weight change learning algorithm , 1993, Proceedings of 1993 International Conference on Neural Networks (IJCNN-93-Nagoya, Japan).

[6]  Anthony Chan Carusone,et al.  Analogue adaptive filters: past and present , 2000 .

[7]  J. N. Babanezhad.  A 3.3 V analog adaptive line-equalizer for fast Ethernet data communication , 1998, Proceedings of the IEEE 1998 Custom Integrated Circuits Conference (Cat. No.98CH36143).

[8]  Dean C. Karnopp,et al.  Random search techniques for optimization problems , 1963, Autom..

[9]  Kenneth W. Martin,et al.  Continuous-time adaptive-analog coaxial cable equalizer in 0.5 /spl mu/m CMOS , 1999, ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349).

[10]  A.J. Baker.  An adaptive cable equalizer for serial digital video rates to 400 Mb/s , 1996, 1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC.

[11]  R. S. Gyurcsik,et al.  An integrated two-parameter adaptive cable equalizer using continuous-time filters , 1997, Proceedings of 1997 IEEE International Symposium on Circuits and Systems. Circuits and Systems in the Information Age ISCAS '97.

[12]  Bernard Widrow,et al.  A comparison of adaptive algorithms based on the methods of steepest descent and random search , 1976 .