Transistor at low frequencies - Internal capacitances as open circuits

Q.  Why do the internal capacitances of transistor at low frequencies treated as open circuits by completely neglecting their effects in analysis?
- Published on 23 Sep 15

a. Due to high reactance
b. Due to low reactance
c. Due to moderate reactance
d. None of the above

ANSWER: Due to high reactance

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    At low frequencies, internal capacitances of transistor have a tendency to provide high reactance. Due to this tendency of internal capacitance at low frequencies, transistors are almost treated in the form of open circuits.

    Since they act as open circuits, their effects are almost negligible. So,it becomes quite easier to eliminate or omit them from the equivalent circuit by neglecting their effects.

    On the contrary, internal capacitance of the transistor offers very low reactance at high frequencies.

    However, under such condition, it becomes necessary to consider the effects of transistor's behavior for the analysis purposes.

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