patricky
Junior Member level 1
With a differential amplifier, can we tie capacitors (from output to input) in a positive feedback manner to get negative capacitance due to the Miller effect? I heard it can be used in practice to negate the loading of the gate-to-drain capacitance at the input.
If this is the case, what prevents us from going so far to increasing this feedback cap to negating all the capacitance loading the input (parasitics, gate-to-source capacitance of input transistor, etc...) as well?
I know we could run into instability problems if it goes too far, but there must be other terrible things that prevent frequent use of this technique in practice. It looks too good to be true.
Any help on this would be great. Thanks a lot.
If this is the case, what prevents us from going so far to increasing this feedback cap to negating all the capacitance loading the input (parasitics, gate-to-source capacitance of input transistor, etc...) as well?
I know we could run into instability problems if it goes too far, but there must be other terrible things that prevent frequent use of this technique in practice. It looks too good to be true.
Any help on this would be great. Thanks a lot.