*8.18 The circuit shown in Fig. P8.18 is known as a current conveyor.
(a) 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 β to be large, corresponding transistors are matched, and all transistors are operating in the active region.
(b) 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- kΩ resistor, what current flows through Z?
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