Read channel having auto-zeroing and offset compensation, and po

Details Read channel having auto-zeroing and offset compensation, and po Read channel having auto-zeroing and offset compensation, and po

1994-11-01

1997-07-15

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327551, 327 95, H03L 500

Patent

active

056487380

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

REFERENCES:
patent: 4523107 (1985-06-01), Peterson
patent: 5028815 (1991-07-01), Van De Plassche
patent: 5168179 (1992-12-01), Negahban-Hagh
patent: 5391937 (1995-02-01), Baggini et al.
patent: 5410269 (1995-04-01), Ohie et al.
patent: 5459679 (1995-10-01), Ziperovich
"A 27 MHz mixed analog/digital magnetic recording channel DSP using partial response signalling with maximum likelihood detection", Schmerbeck, et al, IEEE International Solid-State Circuits Conference; 1991 pp. 136-137 No Month.

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