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%% Rise Time, Reference-Level Instants, and Reference Levels % Determine the rise time, reference-level instants, and reference levels % in a 2.3 V clock waveform sampled at 4 MHz. % Copyright 2015 The MathWorks, Inc. %% % Load the 2.3 V clock waveform along with the sampling instants. load('transitionex.mat','x','t') %% % Determine the rise time, reference-level instants, and reference levels. [R,lt,ut,ll,ul] = risetime(x,t); %% % Plot the waveform with the lower- and upper-reference % levels and reference-level instants. Show that the rise time is the % difference between the upper- and lower-reference level instants. plot(t,x) xlabel('seconds') ylabel('Volts') hold on plot([lt ut],[ll ul],'o') hold off fprintf('Rise time is %g seconds.',ut-lt)