| 摘要 |
A disk drive apparatus reads information with high accuracy from an information read/write medium. Information recorded on the information read/write medium is optically read with a pickup, and in accordance with the read signal Sin, an RF signal generated by an RF signal generation circuit is supplied to a frequency characteristic compensation circuit to generate an RF signal having a compensated frequency characteristic. Here, the frequency characteristic compensation circuit 10 is an equalizer comprising a differential amplifier, fixed resistors, variable resistors, and variable capacitance element. Values of the variable resistors and the variable capacitance element are adjusted to variably adjust the frequency characteristic of the frequency characteristic compensation circuit.
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