A BiCMOS 10Gb/s adaptive cable equalizer

Abstract

A cable equalizer for IOGbis broadband data using a SiGe BiCMOS process is presented. The circuit consists of a feedforward amplifier with a variable peaked that compensates for a copper cable of length up lo 3 feet, and a feedback circuit that detects the data transition times and generates an appropriate control voltage. The detector makes use o f a novel circuit based on the source-coupled node of a differential pair.

A 10 Gb/s adaptive cable equalizer using phase detection technique in 0.13µm CMOS technology

“…The edge-speed detection and spectrum balancing technique are widely adopted in conventional equalizers [2][3][4][5][6][7][8]. These techniques either utilize offset-sensitive rectifiers 978-1-4673-0219-7/12/$31.00 ©2012 IEEE or have complex dual-loop designs.…”

“…Utilizing an adaptive cable equalizer is an efficient and robust solution to equalize the received signal. Recently, relevant papers on high speed equalizers were published [2][3][4][5][6][7]. Wide bandwidth circuit techniques are extensively adopted, such as resistive and capacitive source degeneration, inductive peaking, negative capacitance, and active feedback.…”

“…Thus, using rectifiers to detect edge-speed induces offsetsensitive performance. Several dual-loop topologies have been developed to control the swing and the slope of the equalized signal simultaneously [2][3][4]. By comparing the low-frequency and high-frequency power of the equalized signal, both the slicer and the swing control loop can be excluded and a much simpler single-loop topology can be developed [5].…”

“…Most detection mechanisms are categorized as frequencydomain approaches, most of which employ spectrum comparison or spectrum balancing techniques [2][3][4][5]. However traditional time-domain approaches may apply slope detectors, facing the problem of offset-sensitive performance and few tens of millivolts signal difference.…”

A Comparison of Equalizers for Compensating Polarization-Mode Dispersion in 40-Gb/s Optical Systems

“…Analog or "peaking" equalizers have been used in the past for equalizing simple lowpass channels [14]. The potential advantage of this architecture is its relatively simple implementation.…”