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| author | priyanka | 2015-06-24 15:03:17 +0530 |
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| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1691/CH1/EX1.22 | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '1691/CH1/EX1.22')
| -rwxr-xr-x | 1691/CH1/EX1.22/Example1_22.sce | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/1691/CH1/EX1.22/Example1_22.sce b/1691/CH1/EX1.22/Example1_22.sce new file mode 100755 index 000000000..8f58dfbd4 --- /dev/null +++ b/1691/CH1/EX1.22/Example1_22.sce @@ -0,0 +1,46 @@ +//Example 1.22
+clc
+disp("Step 1: Identify topology")
+disp("Vo = 0, does not make feedback zero, but Io = 0 makes feedback to become zero and hence it is current sampling. The feedback is fed in shunt with the input signal, hence topology is current shunt feedback")
+disp("")
+disp("Step 2 and Step 3: Find input and output circuit")
+disp("To find input circuit, set Vo = 0. This gives series combination of R_e2 and 10K across the input. To find output circuit, set V1= 0. This gives parallel combination of R_e2 and 10K at E2.The resultant circuit is shown in fig 1.63")
+disp("")
+disp("Step 4: Replace transistor with its h-parameter equivalent as shown in fig 1.64")
+disp("")
+disp("Step 5 : Find open loop current gain")
+disp("A_I = Io/I_s = -I_c/I_s = -I_o/I_b2 * I_b2/I_c1 * I_c1/I_b1 * I_b1/I_s")
+disp("Io/I_b2 = -h_fe = -100")
+disp("I_c2/I_b2 * I_b1/I_e1 = -h_ie*R_c1 / R_i2+R_c2 because I_b2/I_c1 = R_c1/R_c1+R_i2")
+ri2=1+(101*(10/11))
+format(7)
+disp(ri2,"where R_i2(in k-ohm) = h_ie + (1+h_fe)(1K||10K) =")
+ibb=(-100*2.2)/(92.818+2.2)
+format(6)
+disp(ibb,"Therefore, I_b1/I_s =")
+ibs=(11/12)/(1+(11/12))
+disp(ibs,"I_b1/I_s =")
+ai=100*2.315*0.478
+disp(ai,"A_I =")
+disp("Step 6: Calculate beta")
+b=1/(11)
+format(5)
+disp(b,"beta = R_e2/R_e2+R'' =")
+disp("")
+disp("Step 6: Calculate D,A_If, A_vf, R_if, R_of")
+d=1+(0.09*110.7)
+format(7)
+disp(d,"D = 1 + beta*A_I =") //answer in textbook is wrong
+aif=110.7/11.063
+format(3)
+disp(aif,"A_if = A_I/D =")
+ri=((1*11*1)/((11*1)+(1*1)+(11*1)))*10^3
+format(4)
+disp(ri,"R_i(in ohm) =")
+rif=478/11.063
+format(6)
+disp(rif,"R_if(in ohm) = R_i/D =")
+disp("Ro = infinity")
+disp("Therefore, R_of = Ro*D = infinity because h_oe = 0")
+disp("R''_o = 2.2 k-ohm")
+disp("R''_of = R''_o = 2.2 k-ohm")
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