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4.(20%)
(b)
Figure 4.b shows the circuit for determine the 741 op-amp output resistance when vo is positive and 
is conducting most of the current. Using the resistance of the
network calculated in
4.(a) and neglecting the large output resistance of
, find Ro when is sourcing an output
current of 5mA. (10%,10%)
(a) Using a simple (rπand gm) model for each of the two transistors 
in Figure 4.a,
find the small-signal resistance between A and A '. Where
= 16μA.
非選
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