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Eldo Control Language<br />

Library of Functions for Tasks<br />

fft<br />

Task function category: Functions Operating on Waveforms<br />

The Discrete Fourier Transform (DFT) is used to determine the frequency content of analog<br />

signals encountered in circuit simulation, which deals with sequences of time values. The fft()<br />

function uses the Fast Fourier Transform (FFT) method for calculating the DFT.<br />

Usage<br />

fft(wf)<br />

fft(wf, time_start)<br />

fft(wf, time_start, time_stop)<br />

fft(wf, time_start, time_stop, sampling_frequency)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points,<br />

sampling)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points,<br />

sampling, padding)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points,<br />

sampling, padding, averaging)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points,<br />

sampling, padding, averaging, windowing)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points,<br />

sampling, padding, averaging, windowing, windowing_arg)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points,<br />

sampling, padding, averaging, windowing, windowing_arg,<br />

reference_frequency)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points,<br />

sampling, padding, averaging, windowing, windowing_arg,<br />

reference_frequency, minimum_frequency)<br />

fft(wf, time_start, time_stop, sampling_frequency, number_of_points,<br />

sampling, padding, averaging, windowing, windowing_arg,<br />

reference_frequency, minimum_frequency, maximum_frequency)<br />

Arguments<br />

• wf<br />

Specifies the input waveform name.<br />

• time_start<br />

Specifies the start time of the input waveform.<br />

• time_stop<br />

Specifies the stop time of the input waveform.<br />

• sampling_frequency<br />

Specifies the sampling frequency of the signal.<br />

• number_of_points<br />

Specifies the number of sampling points.<br />

896<br />

Eldo® User's Manual, 15.3

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