Assuming that Y is connected to a voltage V, a current I is forced into X, and t
ID: 2247975 • Letter: A
Question
Assuming that Y is connected to a voltage V, a current I is
forced into X, and terminal Z is connected to a voltage that
keeps Q5 in the active region, show that a current equal
to I flows through terminal Y, that a voltage equal to V
appears at terminal X, and that a current equal to I flows
through terminal Z.
Assume to be large; corresponding transistors are matched, and all transistors are operating in the active region.
With Y connected to ground, show that a virtual ground
appears at X. Now, if X is connected to a +5-V supply
through a 10-k resistor, what current flows through Z?
Explanation / Answer
The terminal Z is base terminal, during beta value is large, then the BASE current is ZERO, ( collector and emitter current is same).
base current and beta relation:
collector current = (base current/beta) if beta large like infinity then collector current is ZERO.
emitter current = base current + collector current