1 files changed, 24 insertions, 0 deletions
diff --git a/3636/CH8/EX8.5/Ex8_5.sce b/3636/CH8/EX8.5/Ex8_5.sce
new file mode 100644
index 000000000..92f0bad4e
--- /dev/null
+++ b/3636/CH8/EX8.5/Ex8_5.sce
@@ -0,0 +1,24 @@
+clc;
+clear;
+IE=1.5*10^-3 //in mA
+Cje=1.2*10^-12 //in F
+Dn=25 //in cm^2/s
+WB=0.4*10^-4 //in cm
+Wdc=2.5*10^-4 //in cm
+vs=10^7 //in cm/s
+Rc=25 //in ohm
+CBC=0.15*10^-12 //in F
+CS=0.12*10^-12 //in F
+Const=0.026 //constant for kT/e in V
+
+//Calculation
+Re=Const*(1/IE) //in ohm
+tau_e=Re*Cje //emitter-base junction charging in s
+tau_b=WB^2/(2*Dn) //transit time in the base in s
+tau_d=Wdc/vs //collector depletion region transit time in s
+tau_c=Rc*(CBC+CS) //collector capacitance charging time in s
+tau_D=tau_e+tau_b+tau_d+tau_c
+fT=1/(2*%pi*(tau_D))
+
+mprintf("Total emitter-to-collector delay time= %0.2e s\n",tau_D)
+mprintf("cut-of frequency of transistor= %0.2e Hz",fT)