Applications and Circuits

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Presentation transcript:

Applications and Circuits Photodiodes Applications and Circuits

Outline Introduction Applications Circuits A product introduction Conclusion

Introduction Why are they important? Semiconductor devices Converting light to current [http://ecee.colorado.edu/~bart/book/book/chapter4/ch4_6.htm] [https://en.wikipedia.org/wiki/Photodiode]

Introduction Principle of operation Types of PDs -PN -PIN -Avalanche -Schottkey PIN structure (Multiplication) [https://de.wikipedia.org/wiki/Avalanche-Photodiode]

Applications Compact disc players Smoke detectors Remote control devices Electrical isolation (Optocouplers) [http://www.safelincs.co.uk/smoke-alarm-types-optical-alarms-overview/]

Circuits The Simplest idea? Not really simple: -Dark current -Noise -Low speed -Unusable output

Circuits Two ways to use PDs -The Photovoltaic Mode -The Photoconductive Mode

Circuits Issues: -Stability -Bias -Noise LNA

A Product Photodetector using PIN PD as light sensor Black package to reduce reflection PIN Photodiode Signal wires

A Product Kerr effect

Conclusions PDs can be used as light sensors They have wide range of application The designed circuit should be compatible with application Doing a lot of study before designing a PD amplifier is necessary!