wyckaka
Newbie level 1
input impedance of voltage follower
Hi! guys,
I got a voltage follower which was formed by connecting the inverting input to the output of opam OPA128 ,say a unit gain amplifier. Is there any effective&pratical way to test the input impedance of it?
Not long ago I caught up with an idea to handle the problem that first, put a large R (ie,1oooMΩ) in series with the non-inverting input of the voltage follower, second, add a dc signal source to the circuit, and then use KVL law to calculate the input impedance of the voltage follower.But the result was far away from expected. Does the idea make sense? What do you guys think?
Many thanks!
Regards.
Kaka
Hi! guys,
I got a voltage follower which was formed by connecting the inverting input to the output of opam OPA128 ,say a unit gain amplifier. Is there any effective&pratical way to test the input impedance of it?
Not long ago I caught up with an idea to handle the problem that first, put a large R (ie,1oooMΩ) in series with the non-inverting input of the voltage follower, second, add a dc signal source to the circuit, and then use KVL law to calculate the input impedance of the voltage follower.But the result was far away from expected. Does the idea make sense? What do you guys think?
Many thanks!
Regards.
Kaka
