From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 284/CH9/EX9.12/ex_12.sce | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100755 284/CH9/EX9.12/ex_12.sce

(limited to '284/CH9/EX9.12/ex_12.sce')

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)
+
+
-- 
cgit