| 摘要 |
A drive circuit for a magnetic recording device is provided in which the stray capacitance and stray inductance of the peripheral wiring of the drive circuit is reduced. Also, the drive circuit increases the read/write frequency of data and the recording density of the magnetic recording device. Specifically, the drive circuit contains a write driver, a read preamplifier, a write predriver, a read postamplifier, and a current signal detecting circuit. The write driver inputs write data and outputs a corresponding writing current to a write head to store information onto a magnetic disk. The read preamplifier supplies a bias current to a read magnetic head to sense information stored on the magnetic disk and amplifies the information as output data. The write predriver inputs a write data signal via a data signal line and a write mode signal and supplies the write data to the write driver based on the write mode signal. The read postamplifier inputs the output data and a read mode signal and amplifies the output data to produce a read data signal based on the read mode signal. The current signal detecting circuit inputs an external current setting signal via the data signal line and generates a current value signal based on the external current setting signal.
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