G - Physics – 06 – G
Patent
G - Physics
06
G
G06G 7/16 (2006.01) G01J 1/44 (2006.01) G01J 3/50 (2006.01) G01R 19/10 (2006.01) G06T 7/00 (2006.01)
Patent
CA 2161608
An electronic circuit extracts a ratio of currents from two sources and provides an output that is a function of the current ratio. An embodiment of the circuit includes a source current that may be provided by a blue-green photodetector and a sinking current that may be provided by a red photodetector. The source current feeds the input of a current splitter formed by a pair of PFETs. A portion of the source current is fed from the current splitter to a current ratio extractor implemented in CMOS. The remaining portion of the current from the current splitter is fed to a node shared with the sinking current and a second input to the current ratio extractor. The current ratio extractor produces an output voltage that is a function of the ratio of the photodiode currents and is substantially independent of the total current. The output voltage provides color information that may be used in low-cost machine vision systems for tasks such as sorting objects based on color or detecting object boundaries while rejecting shadows and reflective glints.
Ridout & Maybee Llp
Rockwell International Corporation
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