How the input impedance of a common emitter transistor amplifier expre – McqOptions

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1.	How the input impedance of a common emitter transistor amplifier expressed in terms of transistor hybrid parameters?
A.	h<sub>ie</sub> (h<sub>fe</sub> h<sub>oe</sub> / Y<sub>L</sub> + h<sub>re</sub>)
B.	h<sub>ie</sub> + (h<sub>fe</sub> h<sub>oe</sub> / Y<sub>L</sub> + h<sub>re</sub>)
C.	h<sub>ie</sub> (h<sub>fe</sub> h<sub>re</sub> / Y<sub>L</sub> + h<sub>oe</sub>)
D.	h<sub>ie</sub> + (h<sub>fe</sub> h<sub>re</sub> / Y<sub>L</sub> + h<sub>oe</sub>)
Answer» D. h<sub>ie</sub> + (h<sub>fe</sub> h<sub>re</sub> / Y<sub>L</sub> + h<sub>oe</sub>)

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