A CMOS DVD 4/spl times/ speed read channel programmable over 5 octaves

Analog interface functions between optical pick-up and DSP in CD/DVD ROM systems include pulse equalization, one-beam tracking error detection, plus many servo and glue functions such as three-beam tracking error generator for CD, shiny mirror surface detector, defect detector, focus and focus error detectors, envelope detector, laser power control, and reference generators, etc.. To date, pulse equalizer and one-beam tracking error generator have been implemented separately using bipolar, and a digital version has been introduced at the standard DVD speed. This work uses CMOS to integrate all read channel functions up to the DVD 4/spl times/ speed. Technical challenges are 5-octave programmability in the pulse equalizer and delay compensation in the one-beam tracking error detector.