| 摘要 |
PROBLEM TO BE SOLVED: To provide a reproduction circuit for a magnetic disk device for stably shifting a write mode to a read mode at high speed. SOLUTION: The reproduction circuit for the magnetic disk device comprising a bias circuit 200 for giving a bias voltage to an MR (magneto-resistance effect type) head 100, an amplifier circuit 300 for amplifying the output of the MR head 100, capacitances C0 and C1 for cutting DC components of the output of the MR head 100, and a conductor amplifier 400 for giving the input bias of the amplifier 300 is further provided with a switch SO for short circuit for charging the DC cut capacitances C0 and C1. When performing mode shift from write to read, a mode shift characteristic that attains both high speed property and stability is obtained by turning the short circuit switch SO on and charging the DC cut capacitances C0 and C1. COPYRIGHT: (C)2007,JPO&INPIT
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