Thanks for your suggestion.
It works fine.
But I would like get it cleared, what does the input capacitance refer to..?
Inside the OPAMP we have only one Miller Capacitor, which is set to decide the Pole and Zero.
So in another way, instead of adding the capacitor across the feedback resistor, we can change this Miller Capacitance to set the Pole.
Yes, you can slow it down, so the input capacitance pole wouldn't be seen. Generally, OP external components must match it's speed class. A 45k feedback resistor with a 100 MHz OP isn't suitable.
I'm not a bipolar guy, but I am quite confused why the feedback cap can remove or push the zero and pole pair to higher frequency?
And by introducing this cross coupled cap will the corner freq be lower in the second bode? if it does decrease the dominant pole, then the corss-coupled cap should not be too small cuz the feedback resistance is supposed to be much larger than the input one.
I don't think that this is the case, you just get a certain gain increase right of the resonance frequency. But the sketched bode diagrams are most likely not drawn to scale. Generally, it's easy to increase OP gain by "bad" feedback, but it won't be usable in regular OP operation.
There may be other effects, too. You have to check the circuit in detail, to know about. But I don't think that they introduce any new insights to wideband OP design.
Hi,
I also did not notice the zero in the bode plot due to the feed back resistor. For that matter, I only went by his problem introduced by the feed back resistor for which I suggested a solution.
Regards,
Laktronics.
Added after 19 minutes:
Hi,
Is this the effect due to a feedforward design in the amplifier?
Regards,
Laktronics