Quote:
Originally Posted by G8HQP Dave
You are confusing two things:
1. a simple model to calculate approximately what the circuit does
2. an explanation of how the circuit works
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Only to the extent that I was trying to point out that, despite the lower device having no voltage gain (as measured across its input and output terminals) its transconductance is responsible for the conversion of signal voltage input into anode signal current (and the current of the series circuit that comprises cascode) and therefore the signal current in the load, regardless of the presence of the upper device (for low frequencies at least). But I agree with all your points too.