Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2006-07-04
2006-07-04
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S214100
Reexamination Certificate
active
07071455
ABSTRACT:
The present invention provides an optical receiver in which a signal detection level is independent on whether a ammeter is connected to a current monitor terminal or not. The optical receiver comprises a photo diode, a first current mirror circuit connected to the photo diode and a second current mirror circuit. The second current mirror circuit has a pair of current path, one of which is connected to the first current mirror circuit and the other of which is connected to the voltage source provided within the optical receiver. The voltage source supplies a bias whether an ammeter is connected to the other of the current path or not. Therefore, the signal detection level attributed to one of the current path is unchanged.
REFERENCES:
patent: 5075627 (1991-12-01), Bodig et al.
patent: 6034518 (2000-03-01), Yuasa
patent: 6188059 (2001-02-01), Nishiyama et al.
patent: 6333804 (2001-12-01), Nishiyama et al.
Epps Georgia
Livedalen Brian
Smith , Gambrell & Russell, LLP
Sumitomo Electric Industries Ltd.
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