Determine lower and upper cut-off frequency, Electrical Engineering

Q. In an amplifier, the maximum voltage gain is 1500 and occurs at 1kHz. It falls to 1060.5 at 20kHz and at 20Hz. Determine

(i) lower cut-off frequency

(ii) upper cut-off frequency and

(iii) bandwidth.

Maximum gain = 1500 x% of 1500 = 1060.5

Thus,
x = 70.7%

(i) Lower cut-off frequency = f1 = 20Hz

(ii) Upper cut-off frequency = f2 = 20kHz

(iii) Bandwidth = f2-f1 = 19.98kHz

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