Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-02-05
1992-07-14
Fields, Carolyn E.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502081, 2502061, H01J 4014
Patent
active
051305291
ABSTRACT:
The semiconductor optical position sensing device comprises an optical position sensing element having two electrodes for generating two photoelectric currents changeable according to an optical position between the two electrodes, two current mirror circuits for converting the two photoelectric currents into two currents respectively; two transistors for converting the two currents into two voltages, respectively; two source followers; and a differential circuit connected between the two transistors via the two source followers, respectively, for differentially generating an optical position current signal on the basis of the two converted voltages. Further, the two source followers are composed of four parallel connected JFETs diagonally arranged close to each other in mutual intersectional positional relationship with respect to each other. Additionally, the two constant current sources are composed of four similarly-arranged JFETs. It is therefore, possible to minimize an offset error in the differential circuit. Further, since no divider is required, all the composing elements can be integrated into a single chip.
REFERENCES:
patent: 4841138 (1989-06-01), Muro
Dunn Drew A.
Fields Carolyn E.
Nissan Motor Co,. Ltd.
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