Semiconductor light detecting integrated circuit

Details Semiconductor light detecting integrated circuit Semiconductor light detecting integrated circuit

1986-10-14

1988-05-17

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, 307311, H01J 3912

Patent

active

047452749

ABSTRACT:
A semiconductor light detecting integrated circuit comprises a light detecting element, a constant current source having a first FET connected in series to the light detecting element and a power source, the constant current source having a region in which a constant current flows through the first FET, and an electrical circuit having a second FET the gate of which is connected to a connecting point between the light detecting element and the constant current source, the electrical circuit providing a two-valued output for the gate voltage at the connecting point generated according to whether or not the output current of the light detecting element reaches a predetermined current set in the constant current region of the constant current source.

REFERENCES:
patent: 3770967 (1973-11-01), Hanna et al.
patent: 3770968 (1973-11-01), Hession et al.
patent: 4328419 (1982-05-01), Lefebvre

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