1mace1
Newbie level 5
Assume we have a common gate amplifier and we have a capacitor CC between the input (Source) and the output (drain). Do we see then a negative miller effect on the input?
Because the gain of the common gate amplifier is gmRL and the miller effect on the input is CC*(1-Av). Thus we get approximately -CC*gmRL. That would mean that we now have a RHP pole which introduces +90 degree of phaseshift. Is this right?
Because normally such negative miller effect is used with a low gain amplifier respectively buffers to lower the capacitance on the input.
Hope anyone can help me.
Because the gain of the common gate amplifier is gmRL and the miller effect on the input is CC*(1-Av). Thus we get approximately -CC*gmRL. That would mean that we now have a RHP pole which introduces +90 degree of phaseshift. Is this right?
Because normally such negative miller effect is used with a low gain amplifier respectively buffers to lower the capacitance on the input.
Hope anyone can help me.