Quote:
Originally Posted by G8HQP Dave
So to derive the equations you quoted you assume that the valves are voltage amplifiers with finite impedances.
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We are in agreement on this. The thing though that perhaps I was a bit obsessed with, shown in the final step that is required to complete the task of the equation solution for the overall gain, it is required that the signal current in the series circuit of cascode arrangement, is multiplied by the external load resistance to calculate Vout. 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 !