发明授权
- 专利标题: Magnetic head write amplifier including current mirrors and switchable current sources
- 专利标题(中): 磁头写放大器,包括电流镜和可切换电流源
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申请号: US489191申请日: 1995-06-09
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公开(公告)号: US5668676A公开(公告)日: 1997-09-16
- 发明人: Johannes O. Voorman , Hendrik J. Pothast , Ho W. Wong-Lam
- 申请人: Johannes O. Voorman , Hendrik J. Pothast , Ho W. Wong-Lam
- 申请人地址: NY New York
- 专利权人: U.S. Philips Corporation
- 当前专利权人: U.S. Philips Corporation
- 当前专利权人地址: NY New York
- 优先权: EPX94201660 19940610
- 主分类号: G11B5/09
- IPC分类号: G11B5/09 ; G11B5/02 ; H03K17/66
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.
公开/授权文献
- US5087181A Sliding structure such as compressor or the like 公开/授权日:1992-02-11