Output Coupling capacitor function in amplifiers

Q.  Which capacitor is used to block DC portion by allowing to pass only AC portion of the amplified signal to load?
- Published on 23 Sep 15

a. Input Coupling Capacitor
b. Bypass Capacitor
c. Output Coupling Capacitor
d. All of the above

ANSWER: Output Coupling Capacitor

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    Discussion

  • Satyawati   -Posted on 29 Sep 15
    In RC coupled CE amplifier, the transistor is connected in common-emitter (CE) configuration and capacitors C1 & C2 are coupling capacitors.
    Input coupling capacitor is used for coupling the ac input voltage to the transistor base. Inversely, the output coupling capacitor (C2) is used for coupling an output of an amplifier to the load resistance or to the next stage of an amplifier.
    The principle function of output coupling capacitor in RC coupled CE amplifier is to block the DC part & allow the passage of only AC part of amplified signal to the load.
    Besides these, input coupling capacitor blocks any DC component present in AC input voltage & couples only AC component of input signal while bypass capacitor offers a low reactance to the amplified AC signal.

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