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DFEs are critical building blocks for long-reach wireline receivers, and optimized hardware implementation for low power is key. DFEs use feedback to equalize data samples. This paper evaluates the advantages and disadvantages of applying feedback optimized for the data eye height to the edge samples. Both loop-unrolled and direct feedback taps are considered. A hybrid method is considered where only...
This paper presents a combined anti-aliasing filter and 2-tap feed-forward equalizer (AAF/FFE) as an analog front-end (AFE) for 2× blind ADC-based receivers. The front-end optimizes the channel/filter characteristics for data-rates of 2-10 Gb/s. The AAF bandwidth scales with the data-rate and the 2-tap FFE is designed without the need for noise-sensitive analog delay cells. The AAF/FFE is implemented...
This paper presents the design of a DFE for a 2x blind ADC-based RX. The DFE is implemented in 65-nm CMOS along with a 2x blind CDR and ADC. Our measured results confirm 5Gb/s data recovery with BER less than 10-12 with a channel introducing 13.3dB of attenuation at the Nyquist frequency of 2.5GHz. Without the DFE, the BER exceeds 10-8.
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