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Chapter 5:3 source of noise (Dark current shot noise (Arising from…
Chapter 5:
3 source of noise
Signal shot noise
Quantum noise arising from discrete nature of incident signals
Photon absorption is a discrete process
Photocurrent fluctuation conforms to "Poisson statistics"
Thermal noise
Arises from random thermal motion of carries in resistive circuit elements
Leads to random fluctuation currents a resistor terminals
Fluctuation due to random motion of electron
Dark current shot noise
Arising from discrete nature of incident nature of photodiode dark current (current without light)
Dark current,Id current with no incident light
The fluctuation of dark current,Id may be viewed using "Poisson statistics"
Dark current,Id=bulk current,Ib + surface ;leakage current,II
SNR and detection sensitivity
SNR ratio of signal current square to total mean square noise current
