1. Applications and Circuits
Photodiodes
Applications and Circuits

2. Outline Introduction Applications Circuits A product introduction
Conclusion

3. Introduction Why are they important? Semiconductor devices
Converting light to current [ [

4. Introduction Principle of operation
Types of PDs -PN -PIN -Avalanche -Schottkey
PIN structure
(Multiplication) [

5. Applications Compact disc players Smoke detectors
Remote control devices
Electrical isolation (Optocouplers) [

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

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

8. Circuits
Issues: -Stability -Bias -Noise
LNA

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

10. A Product
Kerr effect

11. 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!