Changing resistors like attachment, the amplification is increased in case 2. It shows 20 times but theoretical value is 10 times. Why it is increased in case 2?
Probably severe peaking due to pole added by large feedback resistor and input C on inverting terminal.
Put 10pF or 100pF across RFB and see what happens.
What is horizontal time scale/frequency??
Theoretical gain is 11, not ten.
Sorry, the theoretical gain is 11 as you mentioned. The horizontal time is 100ns/div both cases.
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