Discussion
Consider the following :
1. CE stage 2. CC stage
3. OP amp 4. CB stage The correct sequence of the input impedance in increasing order is :
Answer: A
The input impedance rises in the order CB, CE, CC and then the op-amp, so the sequence is 4, 1, 2, 3, the first option. The common base stage has a very low input impedance, the common emitter stage a moderate one, the common collector stage a high one because of the \((1+\beta)R_E\) term, and an op-amp has the highest.
The other options put the CC stage or the CB stage in the wrong place, for example the second makes the CE stage lower than the CB stage.
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