A discrete-time analog signal processor for disk read channels

A signal processor that incorporates equalization, clock recovery, AGC (automatic gain control), and peak detection for waveforms in the disk read channel and operates up to a 40-MHz clock rate is described. The 2- mu m CMOS IC uses precision analog MOS signal processing implemented with scaled-down unit cells and dissipates 500 mW from a 5-V power supply. The IC layout is hand-crafted. The 6.8-mm*4.6-mm die is fabricated in a 2- mu m, double-poly, double-metal technology. Measurements on one half-delay cell show a transfer efficiency of 0.994 and 10-b linearity across full-scale.<>