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// to determine the raise time displayed waveform
// example9-13 in page 279
clc;
// Data given
fH=[20e+6 50e+6];// upper cut-off frequency in hertz
tri=21D-9;// input raise time in seconds
// calculation
for n=1:2
tro=0.35/fH(n);// tro is the raise time in seconds
trd=sqrt(tri^2+tro^2);// trd is the fall time in seconds
printf("for fH=%d MHz,\ntrd=%d ns\n",fH(n)/10^6,trd*10^9);
end
//result
//for fH=20 MHz,
//trd=27 ns
//for fH=50 MHz,
//trd=22 ns
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