Here are a first few tips:
- The task description states "Cinf is a capacitor which behaves as a short-circuit at the frequency of vg". Think how the value of Cinf can influence the gain when it is effectively a short-circuit.
To find a realistic value for this capacitor (1 F is not realistic) I personally would assume an impedance of less than 1 % of R1 as a short circuit. Knowing the frequency of vg allows you to compute the capacitance.
- To find the value for R1 you should ideally analyze the transfer function of the circuit with R2 being the parameter. Then you can find R2 from this transfer function.
If you cannot analyze the circuit, you can find a value for R2 by making a batch of simulations with varying values for R2, changing R2 in the process until you have reached the target gain.
Note: This is not the way a simulator should be used. Normally you use the simulator to verify your theoretical result.
- Select an appropriate amplitude for Vg such that the amplifier operates in the linear region without creating distortions. A very small voltage is sufficient as you will evaluate small signal gain only.
As a note on the side: your ASC file will not simulate. The base of Q8 is not connected, although it looks as if in the schematic. But when you drag Q7 you'll see the open connection: The wire from the base of Q8 is not attached to the base of Q7
View attachment 48385
I'm not sure about the voltage source Vcc. It seems to be a DC source but shows an AC symbol. If you encounter issues when simulating, swap Vcc for a DC source as used for Vcm.