Previous amplifier circuit, light-receiving amplifier...

Details Previous amplifier circuit, light-receiving amplifier... Previous amplifier circuit, light-receiving amplifier...

2007-02-26

2008-08-05

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S201500

Reexamination Certificate

active

07408143

ABSTRACT:
A previous amplifier circuit of the present invention includes: a grounded emitter amplifier circuit using a grounded emitter transistor connected to a light receiving device; another grounded emitter amplifier circuit using another grounded emitter transistor connected to another light receiving device; and a grounded emitter changing switch to be switched in a manner such that an emitter of the grounded emitter transistors is grounded so as to cause only one of the grounded emitter amplifier circuits to operate. A light-receiving amplifier circuit includes the previous amplifier circuit. An optical pickup apparatus includes the light-receiving amplifier circuit.

REFERENCES:
patent: 5930211 (1999-07-01), Sasaki
patent: 7002881 (2006-02-01), Okuda et al.
patent: 2001-202646 (2001-07-01), None

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