Fourier analysis with PSpice

The frequency components of a signal can be obtained directly from PSpice by enabling the Fourier option in the Time Domain (Transient) setup. We will use the common-emitter amplifier circuit shown on page 361. To modify the Time Domain (Transient) setup select PSpice and then Edit Simulation Profile. 

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Select the Output File Options button and fill out the dialog box as shown  

Center frequency chosen at IK Hz because the sinusoidal source had a frequency of 1 kHz. 

The center frequency is 1 kHz, This frequency was chosen to match the frequency of the sinusoidal input voltage. The harmonics that will be calculated are the first nine 1 kHz, 2 kHz, 3 kHz, 4 kHz, 5 kHz, 6 kHz, 7 kHz, 8 kHz, and 9 kHz. There may be others, but we want numerical values for only the first nine. The output variable for the Fourier analysis is the voltage at node Out, VfOUt). This is the output of the amplifier. We could look at the frequency components of any voltage or current, but for this example we are interested only in the output. Click the OK button twice to accept the settings and then run PSpice. 

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