Hi Team,
Good day. I am posting this inquiry on behalf of our customer.
"I have a bootstrapping circuit. When I calculate the impedance of the bootstrapping circuit I am getting an impedance value of 100Gohm using the formula (R1*R2)/R3. When I simulate the circuit in pspice, I get the maximum impedance as 5.8 Mohm. Why?
(disconnected and does not provide other information)
In this circuit consider R1 = 1G; R2 = 1M and Rf = 10K;
The total impedance for the given value is 100Gohms.
I am using pspice simulator for simulation.
Making Rf varying between 1K to 20K; the total impedance value should change. but on simulation, I don't find any change. When I measure the input impedance of the circuit with an input voltage of 1mv, I am getting an input impedance of 5.5Gohm with the trace equation imp(V(U,IN+,I(U,IN+). When I am using trace equation impedance(V(U,IN+), I(U,Out)), I am getting an impedance of 50 GOhms. But I required an input impedance of 100Gohm. How to measure the input impedance of the circuit in pspice. and how to make input impedance as 100Gohm using this bootstrapping circuit."
Please help to advise. Thank you for extending your support.
Kind regards,
Marvin
