Hello I have been tasked with creating a transimpedance amplifier using a multi-stage BJT of common-emitter configurating into a Common-collector configuration. Using mulitsim I have created the circuit and using the values I have been given I have inserted them into the circuit.

Using DC analysis I calculate my quiescent current Icq to be 371e-6 (Icq = vcc/2*RDC) where RDC = RC + RE, using this I found my biasing resisters RB1 and RB2 which was RB1 = 153302(Ohms) and RB2 = 52306 (ohms)

Using the design rule: RB <= 0.1 * (Beta) * Re

The resistors i chose were 150k and 47k which gives an overall RB of 35786 (Ohms)


My issue is with AC analysis of the H-Parameter model (otherwise known as hybrid-pi or simply pi-model).



I have to derive and calculate both the current and voltage gains and the max peak-to-peak current I_in.

Any help is appreciated and any feedback would most likely help aswell.
-Morgan

 

My issue is with AC analysis of the H-Parameter model (otherwise known as hybrid-pi or simply pi-model).

And what is the "issue"?
Show us the Hybrid model and what you have attempted.

 

This is what I have tried so far trying to analyse the gain of the transimpedance amplifier. I understand that the gain is a resistance from the v_o / i_s. So i've tried to get the current i1, i2, i3 in terms of the output voltage but I've went wrong somewhere as the gain is supposed to be unity.

Like I said before, any help is appreciated.

 

After revisiting the circuit analysis, I realised the mistakes I made and incorrect substitutions and finally derived the gain of the transimpedance amplifier.