Light-receiving and amplyfying device capable of widening an AC

Details Light-receiving and amplyfying device capable of widening an AC Light-receiving and amplyfying device capable of widening an AC

1993-05-26

1994-06-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

053212541

ABSTRACT:
A light-receiving and amplifying device includes a plurality of photodiodes and amplifier circuits which receive inputs from anodes of the photodiodes. There is provided a first current mirror circuit for outputting a second current having the same magnitude as that of a first current which is a sum of currents flowing through cathodes of the photodiodes. Further provided is a second current mirror circuit which receives the second current from the first current mirror circuit and receives divided currents each having an even magnitude from the anodes of the photodiodes. An AC operation range of the light-receiving and amplifying device is widened in a simple manner at a low cost without significant dimensional increase of the device.

REFERENCES:
patent: 4485301 (1984-11-01), Gontowski, Jr. et al.
patent: 4760285 (1988-07-01), Nelson

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