Quote:
Originally Posted by Argus25
I was more concerned about the way the signal current came about by the lower device (focusing on transconductance) and the role of the lower device generating it, vs the upper device. But now I know better, thanks !
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Yes. Intuitively the signal current is dependent on the gm of the lower device. The output voltage (and hence the gain) is dependent on the load on the upper device.
The gm of the upper device does have a major impact on how 'still' the join is. And the signal at the join makes a big difference to the Miller fed-back capacitance.