Discussion
What does the hFE value represent in the common-emitter configuration?
Answer: D
\(h_{FE}\) is the forward current transfer ratio.
In h-parameter notation the first subscript names the parameter (i input impedance, r reverse voltage ratio, f forward current ratio, o output admittance) and the second the configuration (e common emitter). Capital subscripts mean the DC value, so
\[ h_{FE} = \frac{I_{C}}{I_{B}} = \beta_{dc} \]
the DC current gain of the transistor in common emitter.
The reverse transfer parameter is \(h_{re}\), a voltage ratio rather than a current ratio. Output behaviour is described by \(h_{oe}\), an admittance. Voltage gain is a circuit quantity that depends on the load, not an h-parameter of the transistor.
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