Current detection circuit

Details Current detection circuit Current detection circuit

2008-10-20

2010-10-05

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140AG, C250S2140SW, C323S271000, C327S490000

Reexamination Certificate

active

07807956

ABSTRACT:
A current detection circuit detects photoelectric current that flows through a phototransistor, and outputs a current, which is proportional to the photoelectric current, via an output terminal. An input-side transistor is a PNP bipolar transistor, and is provided on a current path for the phototransistor. Output-side transistors are PNP bipolar transistors. The base terminals thereof are connected to that of the input-side transistor so as to form a common base terminal, and the emitter terminals thereof are connected to that of the input-side transistor so as to form a common emitter terminal, thereby forming a current mirror circuit. Each of first switches is provided between the collector of the corresponding output-side transistor and an output terminal. Each of second switches is provided between the collector of the corresponding output-side transistor and the ground terminal. A control unit controls the ON/OFF operations of the first switches and the second switches.

REFERENCES:
patent: 2007/0296386 (2007-12-01), Umeki
patent: 06-029758 (1994-02-01), None
patent: 2006-339458 (2006-12-01), None
patent: 2005-216984 (2008-08-01), None

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