Read channel having auto-zeroing and offset compensation, and power-down between servo fields
作者： William G. Bliss , David R. Welland
DOI:
关键词:
摘要: A read channel especially suited for disk drives, the having auto-zeroing and offset compensation operative with sufficient speed to allow powering-down much of electronics between servo fields when a operation is not being executed, disclosed. Auto-zeroing accomplished by temporarily shorting what would have been signal received from pre-amplifier, charging capacitors in feedback loops switched in-circuit various circuits auto-zeroed. After auto-zeroing, any remaining offset, including that imposed an analog-to-digital converter converting analog digitized samples signal, removed filtering digital filter acting as low pass (integrator lossy integrator embodiment disclosed), reconverting output form subtraction input converter. Other aspects invention are also
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