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Electrical Backplane Equalization Using Programmable Analog Zeros and Folded Active Inductors

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4 Author(s)
Jinghong Chen ; Analog Devices Inc., Somerset ; Saibi, F. ; Jenshan Lin ; Azadet, K.

In this paper, we present a low-power small-area electrical backplane equalizer using programmable analog zeros and folded active inductors. We also present a dc-offset cancellation circuit, which occupies less chip area than the traditional offset cancellation schemes. The equalizer circuit was fabricated in a 1.0-V 90-nm CMOS process. With one zero stage, the equalizer occupies 0.015-mm2 chip area and dissipates 12 mW of power. At 4.25-Gb/s data rate, the equalizer provides 7.8-dB gain boost at the Nyquist frequency. Without the use of any transmitter equalization, the analog zero equalizer demonstrated error-free transmission for pseudorandom-bit-sequence-31 data patterns over 34-in lossy FR4 backplanes.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:55 ,  Issue: 7 )