发明名称 |
Magnetic head write amplifier including current mirrors and switchable current sources |
摘要 |
An apparatus for recording on a magnetic record carrier includes a write amplifier comprising four current mirrors which are turned on two at a time by two switchable floating current sources connected between the input terminals of the current mirrors in order to produce a write current of alternating polarity through a write head. The high impedance at the terminals of the write head enables the common-mode voltage across the write head to be fixed at any desired voltage value by means of a common-mode circuit. The symmetrical structure further enables the parasitic capacitances at the write terminals to be neutralized by means of neutralizing capacitors.
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申请公布号 |
US5668676(A) |
申请公布日期 |
1997.09.16 |
申请号 |
US19950489191 |
申请日期 |
1995.06.09 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
VOORMAN, JOHANNES O.;POTHAST, HENDRIK J.;WONG-LAM, HO W. |
分类号 |
G11B5/09;G11B5/02;H03K17/66;(IPC1-7):G11B5/09 |
主分类号 |
G11B5/09 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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