A CMOS Equiripple-Phase Low-Pass Filter for PRML Applications
نویسندگان
چکیده
Partial-Response Maximum-Likelihood (PRML) coding techniques overcome problems associated with intersymbol interference (ISI) on the premise that, once this interference is known, its effect can be removed. A core part of the analogue front-end of a PRML read channel, and the subject of this paper, is a continuous-time low-pass filter which carries out both pulse-shaping and noise-filtering. The maximum cutoff frequency of 75MHz is achieved using unbalanced differential pairs which cancel the parasitic pole introduced by a high-impedance output stage. This cancellation is independent of tuning. The filter was designed on a 0.25pm 2.5V digital process.
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