how to design a single cycle square wave?

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2NOR_Kh 2022-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/1804665-how-to-design-a-single-cycle-square-wave

评论： Chunru 2022-9-14

I want to design a single cycle square wave and for theat I am using 'square' function but I don't know how to make it a single cycle wave.

I'm not exactly sure that for this purpuse I need to change the duty cycle or not, however I feel that's the case. But I wanted to ask professionals here to assure that.

This is my code for that:

f0=2.25e6;

fs=100e6;

t2=0:1/fs:2/f0;

offset=0;

amp=1;

duty=50;

sq_wav=offset+amp*square(2*pi*f0.*t2,duty);

plot(t2,sq_wav)

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Answer 1

Chunru 2022-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/1804665-how-to-design-a-single-cycle-square-wave#answer_1052955

在 MATLAB Online 中打开

% For single square pulse, you can specify:

% pulse width: pw

% simulation time: T

f0=2.25e6;

pw = 1/f0/2;

fs=100e6;

T=2/f0;

offset=0;

amp=1;

%duty=50;

ns = round(T*fs);

t2 = (0:ns-1)/fs;

sq_wav = zeros(ns, 1);

sq_wav(1:ceil(pw*fs)) = 1;

sq_wav=offset+amp*sq_wav;

plot(t2,sq_wav)

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2NOR_Kh 2022-9-14

Thank you!

Could you please explain why you use this line of the code:

ns = round(T*fs);

Chunru 2022-9-14

Number of samples (ns) in the square wave is the prodcut of the simulation time (T) and the sampling frequency (fs) (which is number of samples per unit time).

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