Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1997-06-12
1999-08-17
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
370212, 375238, H03M 508, H03M 100
Patent
active
059400218
ABSTRACT:
An apparatus and method for measuring a characteristic pulse width of a data channel for a data handling device, with particular application to an HDD having an automatic gain control amplifier for amplifying a signal reproduced by a magnetic head, a filter/equalizer circuit for removing a noise component from an output signal from the automatic gain control amplifier and wave-shaping the resultant signal, a rectifier for rectifying an output signal from the filter/equalizer circuit, a first low pass filter for low pass filtering an output signal from the rectifier to detect an average value thereof, and a charge pump and a capacitor for cooperating to control an amplification gain of the automatic gain control amplifier in response to an output signal from the first low pass filter. The apparatus comprises a comparator for comparing the output signal from the rectifier with a predetermined reference voltage and generating a pulse signal in accordance with the compared result, a second low pass filter for low pass filtering an output signal from the comparator to detect an average value thereof, and an analog/digital converter for converting an output signal from the second low pass filter into a digital signal. According to the present invention, the apparatus can measure a PW50 value directly in the HDD, thereby providing for implementation of an improved AZO method.
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Bushnell Esq. Robert E.
Jean-Pierre Peguy
Samsung Electronics Co,. Ltd.
Williams Howard L.
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