Analog complex graphic equalizer for EPR4 channels

A continuous-time analog adaptive equalizer for use in EPR4 channels in magnetic recording is presented. The equalizer is implemented as the summation of several bandpass filters covering different frequency bands as in a graphic equalizer. The outputs from each filter are weighted by a complex coefficient and summed, which results in a linear combiner structure guaranteed to minimize MSE under LMS adaptation. System-level simulations of our 'Complex Graphic Equalizer (CGE)' shows that its performance is comparable to that of a 10-tap FIR equalizer on an EPR4 channel.