hello
try this
all the best
fsin = 100e3; % sine freq
Fs = 100*fsin; % sampling freq
dt = 1/Fs;
duration = 0.2e-3; % signal duration in seconds
samples = ceil(duration*Fs);;
t = dt*(0:samples-1);
offset = dt*(samples/2); % to center the gaussian envelope
a = 200*Fs; % increase or decrease a to change number of periods
signal = sin(2*pi*fsin*t).*exp(-a*(t-offset).^2);
figure(1),plot(t,signal);grid
