I'm working with a three-stage BJT amplifier that takes an input from a DAC with a full-scale output voltage of 0-2.5V.
I've been told from probing the output the gain is somewhere around 100. I was wondering how I went about calculating the gain of the amplifier? Can I just treat it like an opamp and say
Gain = 1 + Rfeedback/Rinput?
Or would I have to calculate the gain of each stage?
I've simulated the model in LTSpice and it kind of works, although I'm not sure if this is just a coincidence.
On the trace I've cantered both input*gain and output to show how similar they are. My other question would be, how does the DC offset get removed when the signal goes through the amplifier?
Any help or links to resources would be great!