A 49-Gb/s, 7-Tap Transversal Filter in 0.18 μm SiGe BiCMOS for Backplane Equalization
نویسندگان
چکیده
This paper describes the first integrated transversal filter for feed-forward equalizers (FFE) operating above 40 Gb/s. Equalization of a 2−1 PRBS over a 9-ft and 6.5-ft cable with SMA connectors is demonstrated on-wafer at 40 Gb/s and 49 Gb/s respectively. The circuit is implemented in a commercial 0.18 μm SiGe BiCMOS process and is based on a differential distributed 7-tap fractionally spaced transversal filter topology. Microstrip transmission lines are employed as delay elements. With input and output return loss better than −10 dB up to 55 GHz, and a 1 x 2 mm die area, the circuit draws 150 mA from a single 5-V supply. Keywords-Equalizer, 40 Gb/s, SiGe BiCMOS, Gilbert cell, microstrip
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