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With the help of neat diagram explain the input characteristics of an NPN transistor in the common emitter configuration.
written 9.4 years ago by gravatar for teamques10 teamques10 ★ 70k modified 3.8 years ago by gravatar for pedsangini276 pedsangini276 • 4.8k

Mumbai University > FE > Sem 1 > Basic Electrical and Electronics Engineering

Marks: 4 M

Year: Dec 2014
basic electrical engineering
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written 9.4 years ago by gravatar for teamques10 teamques10 ★ 70k

Explanation:

enter image description here

  1. After the Outin voltage $I_B \uparrow$ rapidly with small increase in $V_{BE} = \gt$ The dynamic input resistance $r_1$ is small in CE configuration.

    It is given by $r_1=\dfrac{\Delta V_{BE}}{I_B} V_{CE} = constant$

    Shown in above figure

    The value of $r_1$ is typically 1kΩ but can range from 800Ω …

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