RC coupled amplifier- Practical frequency response

Q.  What does an arrow indicate in the below drawn schematic for frequency response curve of RC coupled amplifier?
- Published on 23 Sep 15
Frequency


a. Ideal Frequency Response
b. Practical Frequency Response
c. Both a and b
d. None of the above

ANSWER: Practical Frequency Response

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    Discussion

  • Satyawati   -Posted on 29 Sep 15
    Frequency response of RC coupled amplifier is a plot of frequency (Hz) on X-axis and voltage gain (dB) on Y-axis. It is generally plotted on a semi-log paper. On an ideal basis, the frequency response should be flat over the entire frequency range but practically it does not happen. The arrow indication implies the non-flat response which is possible under the practical considerations.

    Practically, it gets divided into three different regions - Low frequency region, mid frequency region & high frequency region. Low frequency region has low gain of an amplifier due to coupling and bypass capacitors of an amplifier. Mid frequency region has constant level of output voltage and gain.

    Consequently, the gain & output voltage again goes on decreasing in high frequency region due to transistor internal capacitances & stray capacitance. Therefore, various capacitors are responsible in reducing the gain of an amplifier in low & high frequency regions while the constant gain level is achieved in mid frequency region.

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