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US 6,188,059 B1Granted
Photocurrent monitor circuit and optical receiver
AssigneeSumitomo Electric Industries, Ltd.
InventorsNaoki Nishiyama, Satoshi Takahashi, Mitsuaki Nishie
Life of this patent
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Abstract
Since this photocurrent monitor circuit can detect, by way of first and second current mirror circuits 2F, 2R, a current proportional to the photocurrent flowing into a photodiode 1 from a photocurrent monitor terminal IMT, it can monitor the correct photocurrent without its detecting circuit influencing the photocurrent of the photodiode itself.
Claims5
A photocurrent monitor circuit comprising a photodiode for receiving an optical signal;
- a first current mirror circuit having two parallel lines with respective currents flowing therethrough in proportion to each other, one of said lines connecting with one end of said photodiode;
- a second current mirror circuit having one of parallel lines connected to the other line of said first current mirror circuit;
- and a photocurrent monitor terminal connected to the other of said parallel lines of said second current mirror circuit.
Dependencies are inferred from the claim text.