Hello,
I'm confused . How did they get to the following equation for the output impedance of an emitter follower? It's on page 270 of "Electronic devices and circuit theory", Robert L.Boylestad and Louis Nashelsky, 9th edition.
Equation 5.64: Zo=ro//RE//(βre/(β+1))
I would only get to Zo=ro//RE//βre
I have attached the ac equivalent circuit.
I'm confused . How did they get to the following equation for the output impedance of an emitter follower? It's on page 270 of "Electronic devices and circuit theory", Robert L.Boylestad and Louis Nashelsky, 9th edition.
Equation 5.64: Zo=ro//RE//(βre/(β+1))
I would only get to Zo=ro//RE//βre
I have attached the ac equivalent circuit.
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