Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1988-09-21
1991-07-23
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341158, 341159, H03M 136
Patent
active
050347462
ABSTRACT:
A method of digitizing an input analog current signal such as a demodulated servo position error signal in a disk file includes charging a capacitor with the input demodulated signal, and comparing the resulting capacitor voltage with a plurality of thresholds to produce a comparator output signal for each threshold exceeded by the capacitor voltage. The comparator output signals are sampled, and each sampling period a current corresponding to the thresholds exceeded is generated. The generated current is used to draw off charge from the capacitor until an equilibrium voltage is reached. By knowing the current generated to remove from the capacitor the voltage placed thereon by the input current signal, then the total charge applied to the capacitor can be determined. Further digital processing of the input signal value may be done without the use of a complicated digital to analog converter.
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Herbst Gary A.
Jones David M.
Arthur David J.
Berthold Thomas R.
International Business Machines - Corporation
Romano Gary J.
Shoop Jr. William M.
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