Effect of reduced gain in current f/b amplifier

Q.  Reduction in gain of current feedback amplifiers results in low level of accuracy at _________
- Published on 24 Sep 15

a. Low frequencies
b. High frequencies
c. Moderate frequencies
d. Any frequency level

ANSWER: High frequencies

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    Discussion

  • Satyawati Patil   -Posted on 09 Oct 15
    The sole reason for the existence of current feedback amplifier is the high bandwidth value possessed by them.

    Voltage feedback amplifiers (VFA) consist of an open-loop gain,which decreases at very low frequencies at the rate of about -20 dB/decade of frequency. However, the decrease in gain yields poor accuracy at high frequencies.

    Hence, it is clear that the voltage feedback amplifiers exhibit the tendency of losing the gain at high frequencies,whereas the current feedback amplifiers have a tendency of retaining its high gain at very high frequencies. Therefore, the rate of gain decrease is equal for both the amplifiers.

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