Bypass capacitors - Gain loss prevention in RC coupled amplifiers

Q.  Which capacitors assists in preventing the loss of gain due to negative feedback without affecting the DC stability of R-C Coupled amplifier?
- Published on 24 Sep 15

a. Coupling capacitors (Cc)
b. Bypass capacitors (CE)
c. Both a and b
d. None of the above

ANSWER: Bypass capacitors (CE)

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    Discussion

  • Satyawati   -Posted on 29 Sep 15
    In two-stage RC coupled transistor amplifier,two types of capacitors are adopted – Coupling & bypass capacitors in addition to the biasing resistors. Therefore,the DC operating conditions in any stage remain unaffected due to RC coupling. This is so because dc voltages does not coupled from one stage to another because of the coupling capacitors.

    Hence, the bypass capacitors in this configuration of RC coupled transistor amplifier helps in preventing the loss of gain due to negative feedback without causing any disturbance to the DC stability of an amplifier.

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