Question

Common base amplifier current gain,input resistance,voltage gain derivation

Answer 1

Answer:

the emitter current is also the input current, and the collector current is also the output current, but as the transistor is a three layer, two pn-junction device, it must be correctly biased for it to work as a common base amplifier. That is the base-emitter junction is forward-biased.

Common Base Amplifier using an NPN Transistor

Then we can see from the basic common base configuration that the input variables relate to the emitter current IE and the base-emitter voltage, VBE, while the output variables relate to the collector current IC and the collector-base voltage, VCB