Find v1 in the circuits of Figure P8.5(a) and (b). In Figure P8.5(a) the 3-k? resistor “loads” the output; that is, v1 is changed by attaching the 3-k? resistor in parallel with the lower 6-k? resistor. However, in Figure P8.5(b) the isolation buffer holds v1 to vg/2, regardless of the presence of the 3-k? resistor and its value!
Analysis:
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