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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /284/CH9/EX9.12/ex_12.sce | |
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initial commit / add all books
Diffstat (limited to '284/CH9/EX9.12/ex_12.sce')
| -rwxr-xr-x | 284/CH9/EX9.12/ex_12.sce | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/284/CH9/EX9.12/ex_12.sce b/284/CH9/EX9.12/ex_12.sce new file mode 100755 index 000000000..c96a99f37 --- /dev/null +++ b/284/CH9/EX9.12/ex_12.sce @@ -0,0 +1,24 @@ +// Chapter 9_The bipolar transistor
+//Caption_Transistor cut off frequency
+//Ex_12//page 403
+Ie=0.001 //emitter current
+Cje=10^-12
+xb=0.5*10^-4
+vs=10^7
+Dn=25
+xdc=2.4*10^-4
+rc=20
+Cu=0.1*10^-12 //B-C junction capacitance
+Cs=0.1*10^-12 //collector to substrate capacitance
+re=0.0259/Ie
+tau_e=re*Cje*10^12 //emitter base junction charging time
+tau_b=(xb^2)/(2*Dn) *10^12 //base transit time
+tau=xdc/vs*10^12
+tau_c=rc*(Cu+Cs)*10^12
+tau_ec=(tau_e+tau_b+tau+tau_c) //total emitter to collector time delay
+fT=(10^3)/(2*%pi*tau_ec)
+bet=100
+fB=fT/bet //beta cutoff frrequency
+printf('Emitter to collector transit time is %1.1f psec and cut off frequency is %1.2f GHz',tau_ec,fT)
+
+
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