发明名称 |
CMOS low-noise MR read head pre-amplifier circuit |
摘要 |
A preamplifier system is provided for use with a magneto-resistive (MR) sensor. Included is an alternating current (AC) coupling module connected to the MR sensor for blocking a direct current (DC) voltage associated with an input signal, and filtering low frequency noise associated with the input signal. Also provided is a gain stage module coupled to the AC coupling module. The gain stage module includes a plurality of cascode field effect transistors (FETs) configured for amplifying the input signal, while reducing intrinsic noise and increasing operational bandwidth. Coupled to the gain stage module is a control circuit for feeding back an output of the gain stage module for bias regulation and disturbance rejection.
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申请公布号 |
US6870696(B2) |
申请公布日期 |
2005.03.22 |
申请号 |
US20020041796 |
申请日期 |
2002.01.07 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
CHEUNG WAYNE L.;JOVE STEPHEN A. |
分类号 |
G11B5/00;G11B5/012;G11B5/02;(IPC1-7):G11B5/09 |
主分类号 |
G11B5/00 |
代理机构 |
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代理人 |
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地址 |
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