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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