How can I plot the FFT only for a certain duration of the signal.

I have the values of a staircase signal from 0e-6 to 6.6e-6 sampled at 23MHz whose input frequency is 1.2MHz. The values of the signal are stored in a xls. I have called that file is called using xlsread in matlab. I have plotted the graph for the range 0e-6 to 6.6e-6 (mirco seconds)and took FFT and plotted for the whole time range of that signal. But, my concern is how to plot the FFT only for 1.1e-6 to 6.6e-6 (mirco seconds) of the that signal.

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/matlab/ref/fft.html