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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
+\ No newline at end of file