With green I have bandwidh of my circuit. With red is the bandwidth of my first op amp . GBW of the op amp influences my final bandwidth. I need to enlarge the GBW of op amp ,and my teacher said that the hint is Miller effect.What makes you imagine you can?, as far as I'm aware Miller compensation is just to improve stability.
What sort of figures (gain, bandwidth) do you currently have, and what are you looking for?.
I have to increase the bandwidth of my first op amp OPA2111 externally.not many op amps have exposed pins for compensation capacitors. you didn't provide a schematic of the circuit, so nobody but you has a clue where out1 and out3 are in your amplifier and what makes them different. if you are building a discrete op amp, there are a couple of different ways you can alter the GBW of the amplifier. usually that's done by changing the value of the compensation cap between the B and C leads of the voltage amp stage. you can also choose output transistors that provide a minimum of input capacitance, OR reduce the beta in the output stage (simply put miller capacitance is the input capacitance multiplied by the beta (Hfe) of the output stage).