Two-Stage CE Amplifier – How Do I Calculate AC Currents And Voltages

Hi:


I designed a two-stage CE Amplifier circuit with negative feedback. It works fine
in LTSpice. Can someone tell he how to hand calculate the ac currents and voltages?
I have attached the schematic and also the schematic for the ac equivalent circuit.
Thanks

It will take me a few days, but I can write up my hand calculations. Thanks for the schematics. There is an error in the schematic, as the connection between RF1 and (RF2 and Q1emitter) is missing. The schematic for the AC equivalent circuit has this connection. In the AC equivalent circuit, B1 and B2 appear to me to me current sources, each with value 1.04. Am I correct? What are the units of the 1.04 value? I last used spice in 1994 or so, when the input was text only. Am I correct that the resistors are in ohms?

The 1.04 is the dc emitter current. If you need more info please let me know.
John

Resistors are in K ohms as indicated.

Quick gain analysisTreat the circuit as a crude operational amplifier, where the + input is the base of Q1, the - input is the emitter of Q1, and the output is the collector of Q2. The opamp is used in the noninverting mode, so the circuit's voltage gain is approximately (1 + (RF1/RF2)) volts/volts = (1 + (18000ohms/50ohms)) volts/volts = (1 + 360) volts/volts = 361 volts/volts.

fuck off asshole