Abstract
This BiCMOS IC contains all the analog front-end components necessary for the design of a 21-64 Mb/s HDD channel. Major functional blocks include an automatic gain control circuit having both analog and digital modes of operation, a programmable filter with 6-33 MHz bandwidth range, two phase-locked loops with 24-72 MHz center frequency ranges, a differential 6 bit flash A/D converter with 24-72 MHz sampling rates, and a write precompensator having 600 ps step size.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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