Zero level setting circuit for A/D converter in a magnetic disk

Details Zero level setting circuit for A/D converter in a magnetic disk Zero level setting circuit for A/D converter in a magnetic disk

1994-07-06

1997-02-11

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327538, 360 65, H03K 508

Patent

active

056025033

ABSTRACT:
In a magnetic disk drive in which an analog signal having symmetrical positive and negative odd levels with respect to a zero-level is read out of a magnetic disk by a head, the read analog signal is processed by an AGC circuit and a low pass filter, the proceed analog signal is converted into a digital signal by an A/D converter, and the digital signal is demodulated by a demodulator, a zero-level setting circuit for the A/D converter is comprised of: a reference voltage generator for the A/D converter; a zero-level error detector between the read signal and the reference voltage; an accumulator for accumulating the zero-level error from the zero-level error detector; and an equalizer for equalizing the zero-level of the A/D converter to the reference voltage in accordance to an output signal from the zero-level error accumulator. As a result, the conversion accuracy of the A/D converter is improved while employing a small number of bits.

REFERENCES:
patent: 4334185 (1982-06-01), Turney et al.
patent: 4625240 (1986-11-01), Yablonski et al.
patent: 5166559 (1992-12-01), Ishihara
patent: 5418660 (1995-05-01), Sato et al.

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