Problem 14.4 - The Fourier Series of a Pulse with Variable Duty Cycle
*
* This is a three-part problem. The PULSE function is used to describe
* a pulse with a duty cycle (or ratio of ON time to period T) of .25
* in Part 1, a duty cycle of .20 in Part 2, and a duty cycle of .125
* in Part 3.
* The key feature to observe in the frequency spectrum of the pulse
* waveform is that when the inverse of the duty cycle is an integer
* the corresponding integer-valued harmonic component of the frequency
* spectrum will be missing.
*
* Run the program as given and obtain the PROBE graph of the spectrum
* as described in the problem statement.
* Edit and re-run the program to obtain the frequency spectra for the
* two other cases described above and in the problem statement.
*
.OPT NOPAGE NOBIAS
V1 1 0 PULSE(0 7.5 0 .5E-7 .5E-7 249.9E-6 1E-3)
R1 1 0 1K
.TRAN 200U 10M 0 50U
.PROBE
.END
Problem 14.4, Part 2. The Fourier Series of a Pulse with Variable Duty Cycle
*
* Re-write the circuit file above to change the pulse width to
* 199.9 microseconds. This will define a pulse with a duty cycle
* of 1/5, or 20%. Obtain graphs of the waveform and the spectrun.
*
* (insert circuit file)
*
*
*
Problem 14.4, Part 3. The Fourier Series of a Pulse with Variable Duty Cycle
*
* Re-write the circuit file above to change the pulse width to
* 124.9 microseconds. This will define a pulse with a duty cycle
* of 1/8, or 12.5%. Obtain graphs of the waveform and the spectrum.
*
* (insert circuit file)
*