| 摘要 |
PROBLEM TO BE SOLVED: To restrict or eliminate the over-shoot during the transitional response period of a data writing signal supplied to a writing head, without applying the load to the writing head during the period of the stationary state (data writing). SOLUTION: The circuit includes a dynamically coupled attenuation circuit for substantially reducing or eliminating the over-shoot generated by a writing head cable while being coupled to the writing head during the transitional period of the writing signal. During the stational state or data writing period, the attenuation circuit is decoupled from the writing head to prevent the unnecessary load of the writing head. As the preferable executing state, the attenuation circuit includes a capacitor and a resistor arranged in series thereto, and this circuit is coupled in parallel with the writing head. The over-shoot of the writing signal supplied to the writing head is substantially reduced by the resistor, and the resistor is decoupled from the writing head by the capacitor in the stationary state or during the data writing period.
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