Optical receiver

Details Optical receiver Optical receiver

2007-10-30

2007-10-30

Lee, John R. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C330S059000, C330S202000, C330S308000

Reexamination Certificate

active

10926062

ABSTRACT:
An optical receiver. The optical receiver includes a photodiode, a differential transimpedance amplifier, a transistor, and a current source. When the photodiode receives an optical signal, a current signal transmitted from a cathode of the photodiode to an anode thereof is generated. Two input terminals of the differential transimpedance amplifier couple the current signal, and the differential transimpedance amplifier converts the current signal to a voltage signal. In addition, voltage variation of the cathode is coupled to the anode through a voltage follower composed by the transistor and the current source. As a result, voltage of the cathode and that of the anode vary in phase, effectively decreasing a value of the photodiode parasitic capacitance and improving operating bandwidth.

REFERENCES:
patent: 5329115 (1994-07-01), Lim
patent: 5982232 (1999-11-01), Rogers
patent: 6307196 (2001-10-01), Thompson et al.
patent: 6323734 (2001-11-01), Henrion et al.
patent: 6359517 (2002-03-01), Colaco
patent: 6720827 (2004-04-01), Yoon
patent: 6999687 (2006-02-01), Tsai
patent: 7105797 (2006-09-01), Kimura
patent: 2003/0161640 (2003-08-01), Kimura
patent: 2005/0175359 (2005-08-01), Tsai

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