Hello everyone,
I'm trying to calculate the transient behavior of the attached circuit. i t is a model of an avalanche photodiode.
The conditions are:
V_Bias>V_Br
C_D is fully charged.
The time when a photon hits the diode is the time the switch is turned on.
It's clear to me that the asymptotic current is (V_Bias-V_Br)/(R_Q+R_S)=I_0
I'm asking my self how to calculate the transient behavior of the current:
I guess it's something like:
I(t) = I_0+(V_Bias/R_Q-I_0)*exp(-t/(R_Q*C_D)
Is it allowed to use the superposition principle in such a circuit. For me it feels strange to have a resistor and a capacitance in parallel. But actually I've only a very basic knowledge of el. engineering.
Thx in advance for your feedback!
circuit
I'm trying to calculate the transient behavior of the attached circuit. i t is a model of an avalanche photodiode.
The conditions are:
V_Bias>V_Br
C_D is fully charged.
The time when a photon hits the diode is the time the switch is turned on.
It's clear to me that the asymptotic current is (V_Bias-V_Br)/(R_Q+R_S)=I_0
I'm asking my self how to calculate the transient behavior of the current:
I guess it's something like:
I(t) = I_0+(V_Bias/R_Q-I_0)*exp(-t/(R_Q*C_D)
Is it allowed to use the superposition principle in such a circuit. For me it feels strange to have a resistor and a capacitance in parallel. But actually I've only a very basic knowledge of el. engineering.
Thx in advance for your feedback!
circuit
