Test mixed signals matlab ELEN421 Matlab Project one due nex

Test mixed signals, matlab

ELEN421 Matlab Project one (due next Tue. 9/27/16) In the Widlar current source circuit, the Io, RE and Iref with the relation are given below: loRE= 0.025|n(1 r) (1) 0 If Re and Rg and ler are given are given, how to figure out lo is to solve the nonlinear equation (). From the figure above we know, if RE -0 then loIrer; otherwise lo

Solution

clear;
%WIDLAR CURRENT SOURCE CIRCUIT%
%Here,I have used Guass-siedel method to solve the given non-algebraic equation of I_0%
I_ref=input(\'I_ref = (mA)\'); %If I_ref = 4mA give input as 4 only;
R_E=input (\'R_E= (kohms)\'); %If R_E = 2Kohms give input as 2 only;
I_0=1; %initial guess of I0 is 1 mA;
I_0K=(0.025/R_E)*log(I_ref/I_0); %calculating I_0 of next iteration;
N=0; %initiate no of iterations with N=0;
while abs (I_0K-I_0) > 0.00001;
I_0=I_0K;
I_0K=(0.025/R_E)*log(I_ref/I_0);
N=N+1;
end;
disp(\'Number of Iterations N=\')
N
disp(\'Widlar Current I(mA)=\')
I_0

I_ref(mA)	R_E(Kohms)	I_0(mA)	N(no of iterations)
4	2	0.0539	8
4	1	0.0938	9
3	2	0.0509	8