Sensing circuit with a four terminal insulated gate...

Details Sensing circuit with a four terminal insulated gate... Sensing circuit with a four terminal insulated gate...

G - Physics

01

K

340/155, 340/159

G01K 7/02 (2006.01) G01K 7/20 (2006.01) G05D 23/20 (2006.01) H01L 27/07 (2006.01) H01L 27/22 (2006.01) H01L 29/00 (2006.01) H01L 29/26 (2006.01) H01L 31/00 (2006.01)

Patent

CA 1048125

ABSTRACT OF THE DISCLOSURE A sensing circuit for detecting a change in a normal characteristic of an object such as a change in a normal temperature characteristic a change In a normal magnetic field characteristic, or a change in a normal light falling on the sensing element of the sensing circuit is provided. The circuit employs a four-terminal semiconductor device having alternate layers of conductivity type, which has an amplification characteristic of the collector current to the base-emitter grounded, wherein there is a shart decrease in the hFE amplification characteristic at one value of gate to emitter voltage. This point represents the point in which the semiconductor device is biased for a normally desired characteristic being sensed. Whenever there is a deviation from this normal position, there is a sharp rise in the hFE irrespective of what the direction of deviation is. The hFE gain then substantially levels off. -1-

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