1 files changed, 32 insertions, 0 deletions
diff --git a/2534/CH7/EX7.9/Ex7_9.sce b/2534/CH7/EX7.9/Ex7_9.sce
new file mode 100755
index 000000000..79383d975
--- /dev/null
+++ b/2534/CH7/EX7.9/Ex7_9.sce
@@ -0,0 +1,32 @@
+//Ex7_9
+clc
+R1 = 80*10^3
+R2 = 25*10^3
+Re = 2*10^3
+Rc = 2*10^3
+beta = 100
+VCC = 12
+VBE = 0.7
+disp("R1 = "+string(R1)+"ohm")
+disp("R2 = "+string(R2)+"ohm")
+disp("Re = "+string(Re)+"ohm")//emitter resistance
+disp("Rc = "+string(Rc)+"ohm")//collector resistance
+disp("beta = "+string(beta))//current gain
+disp("VCC = "+string(VCC)+"V")//collector supply voltage
+disp("VBE = "+string(VBE)+"V")//base-emitter voltage
+Rb = R1*R2/(R1+R2)
+disp("Rb = R1*R2/(R1+R2) = "+string(Rb)+"ohm")//base resistance
+VB = VCC*(R2/(R1+R2))
+disp("VB = VCC(R2/(R1+R2)) = "+string(VB)+"V")//base voltage
+IB = (VB - VBE)/(Rb*(1+((1+beta)*(Re/Rb))))
+disp("IB = (VB - VBE)/(Rb*(1+((1+beta)*(Re/Rb))))")
+disp("   = "+string(IB)+"A")//base current
+IC = beta*IB
+disp("IC = beta*IB = "+string(IC)+"A")//collector current
+IE = IC
+VCE = VCC - IC*Rc - IE*Re
+disp("VCE = VCC - IC*Rc - IE*Re = "+string(VCE)+"V")//collector-emitter voltage
+disp("operating point is("+string(VCE)+"V, "+string(IC)+"A)")
+S = (1+beta)*[(1+Rb/Re)/(1+beta+Rb/Re)]
+disp("S = (1+beta)*[(1+Rb/Re)*(1+beta+Rb/Re)] = "+string(S))
+disp("S'' = -(beta/Re)/(1+beta+Rb/Re) = "+string((-beta/Re)/(1+beta+Rb/Re)))