A 50-MHZ STANDARD CMOS PULSE EQUALIZER FOR HARD-DISK READ CHANNELS

A novel pulse equalizer for hard disk systems is discussed. Opposed to classical realizations, it is full CMOS while operating at 50 MHz cut off frequency. It is explained how the equalizer can be extended with a selective boost of 13 dB around the cutoff frequency for pulse slimm ing. The equalizer is a gm-C seventh-order, 0.05 degrees equiripple-on -the-phase low-pass filter. It is made out of biquads with matched int egrating nodes. The inaccuracies are compensated with a novel tuning s ystem. This guarantees a ripple on the group delay of 2%. The results are confirmed on 0.7-mu m CMOS silicon.