I know that those C2 and C3 are used to isolate DC from the input and output. Capacitors are always open to DC(w=0) and since the equivalent impedance of a capacitor can be expressed as 1/jwc in frequency domain, to get a low impedance(almost short circuit), I think to use a larger capacitance value like 100F. I know in reality 100F is not a so logical value for common capacitors, however, I use LTspice program and it is easy to use a 100F in a simulation. So I enter 100F for the values of C2 and C3. However, when I do that the results get creepy.
The Vout waveform for 100uF C2 and C3 is a nice sinusoidal wave with gain > 300 ( 620 mVpp nice looking sine wave ) .
But for 100F C2 and C3, the result is,
So, why is this the case? Why using a higher capacitance is not a better thing?
p.s : I hope they were called as "coupling" capacitors.