Quote:
Originally Posted by mhennessy
The input impedance of each transistor is hFE/gm.
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I still tend to prefer transistor analysis as though they were current amplifiers rather than transconductance devices, since the input impedances are low and the input currents not insignificant, most of the time, but it is personal preference and each has advantages/disadvantages.
If you want a rough calculation of the hfe:
see next post