G - Physics – 01 – L
Patent
G - Physics
01
L
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G01L 1/22 (2006.01) G01L 9/06 (2006.01)
Patent
CA 1135529
SEMICONDUCTOR PRESSURE DETECTOR APPARATUS WITH ZERO-POINT TEMPERATURE COMPENSATION Abstract of the Disclosure A semiconductor pressure detector apparatus has a strain - electric signal conversion bridge composed of four semiconductor strain gauges. An amplifier serves to maintain the sum of currents flowing through the bridge at a predetermined value. The midpoints of a pair of arms constituting the bridge are respectively connected to the positive inputs of two negative feedback amplifiers, the outputs of which are applied to a differential amplifier. An output proportional to the difference of the outputs of the former amplifiers appears at the output terminal of the latter amplifier. A potential equal to potentials that appear at the midpoints of the bridge arms when the bridge is balanced at a predetermined temperature and under a predetermined pressure is generated by two resistances connected in series with a supply voltage. This potential is applied through a switch to either of the negative in- puts of the two negative feedback amplifiers to achieve zero-point temperature compensation of the apparatus in an improved manner.
346336
Kawakami Kanji
Nishihara Motohisa
Sato Hideo
Hitachi Ltd.
Kirby Eades Gale Baker
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