Title :
Blind Adaptive Mixed-Signal DFE for Gb/s, Multi-Drop, Buses
Author :
Fredriksson, Henrik ; Svensson, Christer
Author_Institution :
Dept. of Electr. Eng., Linkoping Univ.
Abstract :
This paper presents a mixed signal decision feedback equalizer (DFE) efficiently implementing sign-sign least-mean-square (SS-LMS) coefficient updating, offset estimation and compensation. The equalizer is designed for multi-drop buses and has 16 six bit fully programmable filter coefficients. The equalizer filter is implemented with a novel carry-save-DAC architecture eliminating the carry propagation limiting factor. Measurement results from a test chip are presented showing no transmission errors and good clock skew robustness when receiving data at 700 Mb/s over a heavily polluted channel. The test chip also includes bit error rate (BER) measurement circuits and equalized eye-chart extraction
Keywords :
adaptive equalisers; blind equalisers; decision feedback equalisers; digital-analogue conversion; error statistics; least mean squares methods; 700 Mbit/s; bit error rate; blind adaptive decision feedback equalizer; carry-save-DAC architecture; clock skew robustness; equalizer filter; mixed signal decision feedback equalizer; multidrop buses; offset compensation; offset estimation; sign-sign least-mean-square coefficient updating; Bit error rate; Circuit testing; Clocks; Decision feedback equalizers; Finite impulse response filter; Intersymbol interference; Pollution measurement; Reflection; Robustness; Semiconductor device measurement;
Conference_Titel :
VLSI Design, Automation and Test, 2006 International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
1-4244-0179-8
Electronic_ISBN :
1-4244-0180-1
DOI :
10.1109/VDAT.2006.258165
