LM301A op-amp

Are you placing the compensation capacitor in parallel with Rf?

Are you measuring the gain well below the corner frequency (the frequency at which the capacitor in parallel with Rf) begins to roll off the gain?

Are you operating the LM301A well below it's GBP (Gain Bandwidth Product) of 1 MHz?

Are you operating the circuit in the small signal region (well below an output swing of 10 V/us)?

I am applying three compensation capacitors for my op-amp to observe and analyze the characteristic changes in the behavior of the amplifier by setting 10 points of frequency in order to analyze the frequency response and compensation of the op amp. first two capacitors are 30pF and 20pF with two gains of 1 and 50 for each of them. their changes are similar to each other as both capacitors at both gain have decreased in value of their 20logA when A=gain( 50 and 1). but for 10pF compensation capacitor the value of 20logA only decreases when the gain is 50 but when the circuit has unity gain which is 1 the value of 20logA over Log(omega) increases which is totally the opposite of other two capacitors. can anyone tell me why is this happening ??? I am placing the compensation capacitor in parallel to Rf.

yes i am placing the capacitor in parallel with Rf
i have attached my readings table from the measurement below.

and my question is that why with other two capacitors ( 20pF and 30pF ) when the op-amp has unity gain , the output voltage decreases but with this 10pF capacitor the output voltage increases ?

I don't see the 10, 20, and 30 pF cases in the table.

Is your output voltage measurement simulated or measured? And if measured, what is the capacitive loading of the oscilloscope probe?

as you can see from the attachments below , my question is why the behavior of 10pF is different than 20pF and 30pF at unity gain ???

the X axis is log(omega) and the Y axis is 20logA

Are your graphs measured or simulated?

measured. do you know why is this happening ???

I suspect the peaking is due to oscilloscope probe capacitive loading.

Op Amp frequency response can peak with a capacitive load and the compensation can interact.

An experiment to try is to place a 100 ohm resistor between the Op Amp output and the oscilloscope probe and repeat the measurements. The resistor will tend to isolate the Op Amp from the probe capacitance.

thanks a lot, you really helped me, and thanks for you time.