Derive the low-frequency gain and output impedance of a bipolar emitter follower that is biased with a current mirror. What are these values for a 0.5-mA bias current? Taking into account the finite...

Derive the low-frequency gain and output impedance of a bipolar emitter follower that is biased with a current mirror. What are these values for a 0.5-mA bias current?

Taking into account the finite current gain of bipolar transistors, but ignoring the finite output impedance, find the large-signal current gains of cascode and Wilson current mirrors.