# Photodiode, analog electronic

I am a beginner PSPICE, in simulation electrical and electronics circuits. I want to simulate a schematic with the program Micro-CAP 12. I want to look for some graphics from a photodiode PIN which is a InGaAs Photodiode IG22-Series, I want to monitor follow parameters:

• responsivity (A/W) vs wavelength(nm);

• dark current (A) vs reverse voltage (V);

• shunt resistance vs. temperature;

• detectivity vs. shunt x area;

• capacitance vs. reverse voltage;

• responsivity temperature coefficient.

And at transistor BFP420 I want to monitor some graphics at the following parameters:

• total power dissipation Ptot = ƒ(TS);

• permissible pulse load RthJS = ƒ(tp);

• permissible pulse loadPtotmax/PtotDC = ƒ(tp);

• collector-base capacitance Ccb= ƒ(VCB)f = 1MHz;

• transition frequency fT= ƒ(IC) f = 2 GHz VCE = parameter in V;

• power gain Gma, Gms, |S21|² = ƒ (f) VCE = 2 V, IC = 20 mA;

• power gain Gma, Gms = ƒ (IC) VCE = 2V f = parameter in GHz;

• collector-base capacitance Ccb = f (VCB) VBE = 0, f = 1MHz;

• noise figure F = f (IC) VCE = 2 V, ZS = ZSopt;

• noise figure F = f (IC) VCE = 2 V, f = 1.8 GHz;

I do not know how to begin. Please help me. I accept, if is necessary any simulator of circuits.

• 1) you want to use a circuit simulator, then you need a circuit. 2) do not treat a circuit simulator as "I put something in, something comes out and what comes out is the truth". It does not work like that, if you misunderstand how a circuit simulator works you could make it behave in unexpected ways. Then what comes out is nonsense. How would you know that is so? You have to do some hand calculations so that you know what to expect. Then use the simulator to confirm that and get more accurate data. – Bimpelrekkie May 13 '20 at 9:50
• 3) a simulator relies on a model of a component. If the responsivity vs wavelength isn't modeled then you can (try to) simulate it but you will get a wrong answer. 4) making those transistor parameter plots like Ccb and Noise Figure, is a complex task even for experienced electrical engineers. Also those values are for certain conditions which depend on the circuit which you do not have. All-in-all I think you're way over your head here, you want too much for your skill level. – Bimpelrekkie May 13 '20 at 9:55
• I have a circuit .I kow that I must have a calculation model,which help at behavior characterization of component.The problem is I do not know how to begin. – Dragos Baciu May 13 '20 at 10:17
• If you already know PSpice (at least a little bit) why are you using MicroCap to do this simulation instead of PSpice? – The Photon May 13 '20 at 15:22