An 11.1 Gbps Analog PRML Receiver for Electronic Dispersion Compensation of Fiber Optic Communications

Adaptive Equalizers

“…The decision-feedback equalizer, which we discuss next, does a much better job on such channels [11,13]. 3, we see that the precursor ISI is removed in the same way as in the FFE. However, the postcursor ISI is now removed using the output from the decision circuit instead of the output from the delay line.…”

“…An adaptive MLSE additionally estimates and updates the model parameters based on the incoming signal. The implementation of an MLSE at high bit rates, however, is challenging due to the complexity of the algorithm [1][2][3]. A less demanding ISI canceler is the equalizer.…”

“…The challenge in designing analog time-domain equalizers is to come up with delay elements, multipliers, and summers that have enough bandwidth and precision over process, supply voltage, and temperature. For examples of analog equalizer circuits, see [3,8,[32][33][34].…”