temperature

What opamp did you use and what are the values of the resistors around it?

and your question is...?

"Simulated" means virtual or not real. How can your amplifer be affected by temperature if it's not real?

this is my circuit, I simulated it with PSpice. So because of the change made in the resisters' values the gain varies with temprature, yes?

There is not biasing for the input transistors. Also, I cannot see what device is between the collector and base of the transistor in front of Q3. Run a DC analysis over temp.

There is no device between the collector and base of that transistor. It's a short circuit. That blob on the line is the label for the transistor which I cannot read anyway.

In addition to the lack of biasing, both power supply rails are at positive potential! The (+) side of the batteries are both connected to both rails. What gives?

Ha, ha...I didn't even look at the generators. Than, the first circuitry would be a regular current mirror. Our friend is no more interested in his circuit...

Anyways, your eyes are better than mine.