Electricity: motive power systems – Positional servo systems
Patent
1998-11-06
1999-12-21
Ip, Paul
Electricity: motive power systems
Positional servo systems
318561, 318609, 318610, 364602, 360 46, 360 51, G06J 100, G11B 509
Patent
active
060053631
ABSTRACT:
An apparatus for Position Error Signal (PES) measurement in a disk drive servo system includes a variable-gain amplifier that receives an analog servo signal; a multiplier coupled to the variable-gain amplifier; a low-pass filter coupled to the multiplier; a digital-to-analog converter; an analog summer that is coupled to the low-pass filter and to the digital-to-analog converter; an analog-to-digital converter coupled to the analog summer; a digital summer coupled to the analog-to-digital converter, and a phase-locked loop that provides timing signals to the multiplier, the digital-to-analog converter and the analog-to digital converter. The invention enables an output of the variable-gain amplifier to be multiplied with the clocking signal of the phase-locked loop. The multiplication output signal is then filtered by the low-pass filter. The output of the low-pass filter is summed with voltage ramp signals that are generated by the digital-to-analog converter and the resulting signals are converted to a series of 6-bit words by the digital-to-analog converter. Thereafter, the series of the 6-bit words are summed by the digital summer to generate a 10-bit PES.
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Aralis James
Walker Paul
Brady III Wade James
Donaldson Richard L.
Ip Paul
Swayze, Jr. W. Daniel
Texas Instruments Incorporated
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