The application of a 10-mV, 100-kHz square wave to an amplifier resulted in the output wave form of Fig. 9.81.
a. Write the Fourier series expansion for the square wave through the ninth harmonic.
b. Determine the bandwidth of the amplifier to the accuracy available by the waveform of Fig. 9.81.
c. Calculate the low-cutoff frequency.

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4%, (mV) 100 80 70 60- 40 r(pus) FIG. 9.81 Problem 31