Discussion
Consider the following devices :
1. BJT in CB mode
2. BJT in CE mode
3. JFET
4. MOSFET The correct sequence of these devices in increasing order of their impedance is
Answer: C
The increasing order of impedance is BJT in CB, BJT in CE, JFET, MOSFET, 1, 2, 3, 4, option (C).
A common base stage has a very low input impedance, a common emitter stage has a moderate one, a JFET has a high one because its gate junction is reverse biased, and a MOSFET has the highest because its gate is insulated by oxide.
Options (A) and (B) put the CE stage below the CB stage, and (B) and (D) put the JFET above the MOSFET, both of which reverse the order.
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