Two terminal integrated circuit light-sensor

Details Two terminal integrated circuit light-sensor Two terminal integrated circuit light-sensor

1981-08-27

1984-03-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, 330288, 330308, 354465, 356226, H01J 4014

Patent

active

044396732

ABSTRACT:
In a silicon integrated circuit there is formed a silicon photo-diode connected to the input of a multiple stage current-mirror amplifier. The output branch of the amplifier is connected between the two power supply terminals. When voltage is applied to the two power supply terminals the current that flows is the sum of the currents in each branch of the three stage amplifier. Since each branch current is proportional to the current "generated" by the photo-diode, the total power supply current is proportional to the ambient light intensity. Thus a small two terminal photo-conductor type sensor is made that exhibits an unusually high sensitivity that is stable with temperature.

REFERENCES:
patent: 3418592 (1968-12-01), Solomon et al.
patent: 3621562 (1971-11-01), Patel
patent: 3822387 (1974-07-01), Mulder
patent: 3850809 (1974-11-01), Mannonen
patent: 4085411 (1978-04-01), Genesi
patent: 4092611 (1978-05-01), Frederiksen et al.
patent: 4118621 (1978-10-01), Monticelli et al.

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