Optical receiving circuit

Details Optical receiving circuit Optical receiving circuit

2008-03-13

2009-12-22

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C330S308000, C398S202000

Reexamination Certificate

active

07635837

ABSTRACT:
A light receiving circuit includes: a first transimpedance amplifier configured to convert an input signal to a voltage signal, the input signal being current-converted by a first photodiode; a second transimpedance amplifier connected to a light-shielded second photodiode, and being configured to output a reference voltage; a differential amplifier; a transconductance amplifier; a voltage source; and a conversion element. The differential amplifier has a first terminal and a second terminal, and amplifies a difference between the voltage signal inputted to the first terminal and a signal inputted to the second terminal. The transconductance amplifier receives as input a branch of the voltage signal and outputs a current signal to the second terminal. The voltage source superimposes an offset voltage on the output voltage of the second transimpedance amplifier. The conversion element is provided between the voltage source and the second terminal, and voltage-converts the current signal.

REFERENCES:
patent: 5247211 (1993-09-01), Sakura
patent: 6038049 (2000-03-01), Shimizu et al.
patent: 6885249 (2005-04-01), Suzunaga
patent: 7449669 (2008-11-01), Sakura
patent: 2007/0075886 (2007-04-01), Sakura et al.
patent: 2007/0126507 (2007-06-01), Sakura
patent: 06216854 (1994-08-01), None
patent: 09083315 (1997-03-01), None
Japanese Office Action dated Jul. 14, 2009 corresponding to U.S. Appl. No. 12/047,718 filed on Mar. 13, 2008.

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