发明名称 |
PRESSURE TRANSDUCER WITH TEMPERATURE COMPENSATION CIRCUIT |
摘要 |
A pressure transducer is disclosed comprising a pressure sensor portion having gage resistors in bridge formed on a thin diaphragm of a semiconductor substrate, and a power supply connected to the pressure sensor portion for driving the pressure sensor. The power supply includes a first current source for supplying a temperature-dependent current equivalent to the sum of a current almost proportional to the absolute temperature and a current independent of temperature, and a second current source for sinking the current almost proportional to the temperature characteristic of the gage resistors from the current of the first current source. A temperature compensation circuit is additionally provided to drive the bridge circuit by the difference between the temperature-dependent current and the current proportional to the temperature characteristic in a constant-current driving mode, and by a voltage proportional to the current difference when the output of the bridge circuit is connected to an amplifier whose gain is dependent on temperature. |
申请公布号 |
DE3373343(D1) |
申请公布日期 |
1987.10.08 |
申请号 |
DE19833373343 |
申请日期 |
1983.08.09 |
申请人 |
HITACHI, LTD. |
发明人 |
YAMADA, KAZUJI;SATO, HIDEO;KATO, KAZUO;SASAYAMA, TAKAO;KAWAKAMI, KANJI;KANZAWA, RYOSAKU |
分类号 |
G01L9/04;G01B7/16;G01L9/00;G01L9/06;(IPC1-7):G01L9/00 |
主分类号 |
G01L9/04 |
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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