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Diffstat (limited to '3740/CH7/EX7.4/Ex7_4.sce')
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1 files changed, 28 insertions, 0 deletions
diff --git a/3740/CH7/EX7.4/Ex7_4.sce b/3740/CH7/EX7.4/Ex7_4.sce new file mode 100644 index 000000000..d037387d8 --- /dev/null +++ b/3740/CH7/EX7.4/Ex7_4.sce @@ -0,0 +1,28 @@ +//Optoelectronics - An Introduction, 2nd Edition by J. Wilson and J.F.B. Hawkes
+//Example 7.4
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+
+//given
+k=1.38e-23;//Boltzmann constant in SI Units
+T=300;//Absolute temperature in K
+R=1e3;//Load resistance in Ohms
+Deltaf=1e3;//Bandwidth of the photo multiplier in Hz
+e=1.6e-19;//Electronic charge in C
+iT=1e-14;//Dark current in A
+
+
+DeltaVj=sqrt(4*k*T*R*Deltaf);
+mprintf("\n DeltaVj = %.1e V",DeltaVj);
+//The answer provided in the textbook is wrong
+
+Deltais=sqrt(2*iT*e*Deltaf);//Corresponding magnitude of rms current fluctuations in A
+mprintf("\n Deltais = %.1e A",Deltais);
+
+//Let the photomultiplier gain be G
+G=1e7;//Given
+//Let the shot noise voltage signal across R be DeltaVj2
+DeltaVj2=Deltais*G*R;
+mprintf("\n DeltaVj2 = %.1e V",DeltaVj2);
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