发明公开
- 专利标题： A circuit for biasing a magnetoresistive sensor and amplifying signals produced thereby
- 专利标题（中）： 用于放大磁传感器和放大信号的电路
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申请号： EP87108643申请日： 1987-06-16
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公开(公告)号： EP0251023A3公开(公告)日： 1988-08-24
- 发明人: Jove, Stephen Alan , Klaassen, Klaas Berend , Nomura, Calvin Shizuo , Van Peppen, Jacobus Cornelis Leonardus
- 申请人： International Business Machines Corporation
- 专利权人： International Business Machines Corporation
- 当前专利权人： International Business Machines Corporation
- 优先权： US880419 19860630
- 主分类号： G01R33/06
- IPC分类号： G01R33/06
摘要：
The resistance (Rh) of a magnetoresistive sensor is disposed between the bases of a differential pair of transistors (T1a and T1b) comprising the input stage of an amplifier. Constant bias voltage for the sensor is provided (by J1 and RE) independently of the resistance of the sensor. DC feedback (from g₀) to the input stage balances current flow in both paths of the differential input stage to correct for DC offset arising in the output from the input stage emitter resistor (RE). The amplified signal represents ΔR h /R h , where ΔR h is the change in steady-state resistance, R h , of the sensor.
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