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Q. Graph of input characteristic of common emitter amplifier is

Delhi UMET/DPMTDelhi UMET/DPMT 2007Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

The input characteristics of common emitter amplifier is the curve between base current $I_B$ and base-emitter voltage $V_{BE}$ at constant collector-emitter voltage $V_{CE}$.
image
The input characteristics can be determined by the circuit shown in figure. Keeping $V_{CE}$ constant (say at $0 V$), note the base current $I_B$ for various values of $V_{BE}$.
Then, plot the readings obtained on the graph, taking $I_B$ along Y-axis and $V_{BE}$ along X-axis. This given the input characteristic at $V_{CE} = 0 V$. Following a similar procedure, a family of input characteristics can be drawn. These curves are similar to as shown in option (b )