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Diffstat (limited to '2459/CH13/EX13.14/Ex13_14.sce')
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1 files changed, 21 insertions, 0 deletions
diff --git a/2459/CH13/EX13.14/Ex13_14.sce b/2459/CH13/EX13.14/Ex13_14.sce new file mode 100644 index 000000000..b6e2a0064 --- /dev/null +++ b/2459/CH13/EX13.14/Ex13_14.sce @@ -0,0 +1,21 @@ +//chapter13
+//example13.14
+//page288
+
+R1=45 // kilo ohm
+R2=15 // kilo ohm
+Re=7.5 // kilo ohm
+Vcc=30 // V
+Vbe=0.7 // V
+gain_beta=200
+
+V2=Vcc*R2/(R1+R2) // voltage across R2
+Ve=V2-Vbe // voltage across Re
+Ie=Ve/Re
+re_dash=1d-3*25/Ie // in kilo ohm
+Zin_base=gain_beta*re_dash
+Zin=Zin_base*(R1*R2/(R1+R2))/(Zin_base+R1*R2/(R1+R2))
+
+printf("input impedence of amplifier circuit = %.3f kilo ohm \n",Zin)
+
+// the accurate answer for input impedence is 3.701 kilo ohm but in book it is given as 3.45 kilo ohm
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