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Modern broadband communication systems require high-speed receivers to process serial data at tens of gigabits per second. As the data rate reaches 40Gb/s, skin-effect and dielectric loss in the transmission medium cause significant loss at high frequencies, leading to considerable ISI even if the data is transmitted over a short copper cable. To reduce the ISI and improve the BER, extensive equalization...
This paper presents a 40 Gb/s serial-link receiver including an adaptive equalizer and a CDR circuit. A parallel-path equalizing filter is used to compensate the high-frequency loss in copper cables. The adaptation is performed by only varying the gain in the high-pass path, which allows a single loop for proper control and completely removes the RC filters used for separately extracting the high-...
A 40Gb/s transimpedance-AGC amplifier is implemented in 90nm CMOS. The TIA uses reversed triple-resonance networks and negative feedback in a common-gate configuration. Operating at 40Gb/s, the amplifier provides 520 mVpp-diff output swing for a current range of 0.44 to 4 mApp, achieved by AGC. The integrated input-referred noise is 3.6muArms and the total power consumption is 75mW.
A 10Gb/s AGC amplifier is implemented in 0.18mum CMOS technology. The circuit uses a linear-in-dB controlled VGA with 58dB tuning range. For input swings from 18mVpp to 1Vpp, the output swing is 430mVpp within +0.4 to -0.8dB variations. The measured dynamic range is 35dB with BER <10 -12. The AGC consumes 54mW from a 1.8V supply
A direct conversion receiver for MB-OFDM UWB communication systems operating in 3.1-10.6GHz is presented. It integrates a low noise amplifier (LNA), quadrature mixers, and baseband 6th-order channel-select filters with programmable gain. The receive chain provides conversion gain of 77dB with 58dB control range. The NF is about 5.8dB in 3-5GHz, rising to 7.6dB at 8GHz, and still below 9.3dB up to...
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