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Decision feedback equalizers (DFEs) play a critical role in high-speed communications through band-limited channels. We implemented a 3-tap DFE receiver for 5-Gb/s data bandwidth. To realize a multi-tap DFE operation, a digital-control scheme is proposed that does not use analog circuits for biasing, such as DACs. In addition to the conventional loop unrolling, several techniques including combined...
A 16 Gb/s 1st-tap FFE and 3-tap DFE is developed featuring 33% faster operation than conventional DFEs. The presented technique is employed for high-speed 1st-tap ISI equalization and for jitter reduction in equalized edges. By-path feedback and a voltage swing limiter have been developed to speed-up both 2nd-tap and 3rd-tap equalization. The DFE is fabricated in a 90 nm CMOS process, occupies 227??276...
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