| 摘要 |
PROBLEM TO BE SOLVED: To provide a read channel semiconductor integrated circuit (IC) in which offset voltage of input waveform is reduced. SOLUTION: The IC is equipped with an offset control circuit which rectifies the offset voltage: a pattern generation circuit which outputs a pattern signal (expectation) which is equal to a write-in control signal to write into a hard disk; a digital signal processing part consisting of a decoder which applies decoding of the pattern signal to a signal which is written into a hard disk; a capacitance 4 which generates a pseudo-waveform signal when writing into a magnetic disk with a magnetic head based on a decoded signal; an A/D converter signal processing part to process the pseudo-waveform signal into a digital signal which is read by an MPU (microprocessor unit); and a bit comparison circuit which carries out bit comparison of the pattern signal and the signal which is read by the MPU from the A/D converter signal processing part and outputs a bit error rate. COPYRIGHT: (C)2004,JPO
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