发明授权
- 专利标题: Temperature-compensated current source for use in a hall analog magnetic-field detector
- 专利标题(中): 用于霍尔模拟磁场检测器的温度补偿电流源
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申请号: US119851申请日: 1993-09-10
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公开(公告)号: US5389889A公开(公告)日: 1995-02-14
- 发明人: Jay M. Towne , Ravi Vig , Paul W. Latham, II
- 申请人: Jay M. Towne , Ravi Vig , Paul W. Latham, II
- 申请人地址: MA Worcester
- 专利权人: Allegro Microsystems, Inc.
- 当前专利权人: Allegro Microsystems, Inc.
- 当前专利权人地址: MA Worcester
- 主分类号: G01R33/07
- IPC分类号: G01R33/07 ; G05F3/26 ; H03F15/00
摘要:
A temperature-compensated current source energizes a Hall element. The current source includes a voltage divider across the DC voltage supply busses and a differential amplifier arranged as a voltage follower which develops the output voltage across a reference resistor, creating a reference current which is amplified to generate a Hall energizing current. This results in a Hall element gain which is controllable over temperature. The temperature coefficient of the resistor can be chosen to compensate for the sensitivity temperature coefficient of a Hall element powered by a constant current source. Additionally, the temperature coefficient of the resistor may be chosen to compensate for the temperature coefficient of a magnet used to generate the magnetic field which the Hall element is intended to detect. The magnitude of the Hall current, and thus the Hall element gain, is directly proportional to the magnitude of the DC voltage supply. A trimmable current amplifier is used to compensate for the effects of manufacturing tolerances on the magnitude of the Hall current.
公开/授权文献
- US6023792A Portable toilet 公开/授权日:2000-02-15