Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1983-08-11
1985-12-03
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307297, 307310, 73708, 338 3, 323907, G01L 906
Patent
active
045568073
ABSTRACT:
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.
REFERENCES:
patent: 4000643 (1977-01-01), Pearson
patent: 4079308 (1978-03-01), Brown
patent: 4233848 (1980-11-01), Sato et al.
patent: 4325018 (1982-04-01), Schade, Jr.
patent: 4355537 (1982-10-01), vander Have
patent: 4446527 (1984-05-01), Runyan
patent: 4463274 (1984-07-01), Swartz
Cattaneo et al., "The Industrial Application of the Piezoresistive Effect: A Low Cost Thick-Film Pressure Sensor", Proceedings of the 30th Electronic Components Conference, San Francisco, CA, USA, Apr. 28-30, 1980, pp. 429-435.
Kanzawa Ryosaku
Kato Kazuo
Kawakami Kanji
Sasayama Takao
Sato Hideo
Hitachi , Ltd.
Hudspeth D. R.
Miller Stanley D.
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