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+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar
+//Example 6.4
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+R=5e6;//effective resistance in ohms
+CT=5e-12;//capacitance in Farads
+T=300;//temperature in kelvin
+Rf=1e5;//resistance in ohms
+A=400;//open loop gain
+KB=1.38e-23//boltzman constant in S.I. unit
+//case 1:
+Rtl=[(R)*(R)]/[(R)+(R)];//total effective load resistance
+u=2*3.14*Rtl*CT;
+B=1/u;//maximum bandwidth in Hz
+mprintf("The maximum bandwidt obtained equalization is=%.2f *10^4Hz",B/1e4);//multiplication factor to change unit
+
+//case 2:
+v=4*(KB)*T;
+i2th=v/Rtl;//thermal energy noise current per bandwidth in A^2/Hz
+mprintf("\nThermal energy noise current per bandwidth is=%.2f *10^-27 A^2/Hz",i2th*1e27);
+
+//case 3:
+x=2*%pi*Rf*CT;
+B=A/x;//maximum bandwidth without equalization for transimpedance
+mprintf("\nMaximum bandwidth without equalization for transimpedance is=%.2f*10^8Hz",B/1e8);
+//Assuming Rf<<Rtl then the thermal energy noise current per bandwidth is given by
+i2th=v/Rf;
+mprintf("\nFor Rf<<Rtl the thermal energy noise current per bandwidth is=%.2f *10^-25 A^2Hz",i2th*1e25);
+// the answer in book is wrong