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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 /73/CH10/EX10.9/Example10_9.sci | |
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| -rwxr-xr-x | 73/CH10/EX10.9/Example10_9.sci | 43 |
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diff --git a/73/CH10/EX10.9/Example10_9.sci b/73/CH10/EX10.9/Example10_9.sci new file mode 100755 index 000000000..358cb7d07 --- /dev/null +++ b/73/CH10/EX10.9/Example10_9.sci @@ -0,0 +1,43 @@ +//Chapter 10_Special Purpose Amplifiers
+//Caption : Common Emitter Amplifier Parameters
+//Example10.9: A single common emitter amplifier has following device and circuit parameters: Rb=60 Ohm,Rs=40 Ohm,Cu=1.5 pF,Cl=1 pF,ft=1.6 GHz at Ic=2.5 mA quiescent current.Determine each of the following for two values of Rl: 30 Ohm and 100 Ohm. a)f1 b)F2 (c)BW (d)Avmid (e)avmid*Bw.
+clear;
+clc;
+Ft=1.6*10^9;//reduced unity gain frequency in Hz
+Ic=2.5*10^-3;//collector current in A
+Vt=25*10^-3;//threshold voltage at room temperature
+gm=Ic/Vt;//transconductance
+Cu=1.5*10^-12;
+Cl=1*10^-12;
+Rs=40;
+Rb=60;
+C2=gm/(2*%pi*Ft)-Cu
+for i=1:2,
+ if i==1 then
+ Rl=30;//load resistance
+ F1=1/(2*%pi*(Rs+Rb)*(C2+Cu*(1+gm*Rl)));// first break frequency
+ F2=1/(2*%pi*Rl*(Cu+Cl));//second break frequency
+ BW=F1;//since single common emitter amplifier so n=1 thus BW=F1*sqrt(2^(1/n)-1),i.e.,BW=F1
+ Avmid=-gm*Rl;//mid frequency gain
+ GBW=Avmid*BW;// gain-bandwidth product
+ disp('********For Rl=30 Ohm********')
+ disp('MHz',F1/10^6,'first break frequency is:')
+ disp('MHz',F2/10^6,'second break frequency is:')
+ disp('MHz',BW/10^6,'Bandwidth is:')
+ disp(abs(Avmid),'mid frequency gain is:')
+ disp('MHz',abs(GBW)/10^6,'gain-bandwidth product is:')
+ else
+ Rl=100;//load resistance in ohm
+ F1=1/(2*%pi*(Rs+Rb)*(C2+Cu*(1+gm*Rl)));// first break frequency
+ F2=1/(2*%pi*Rl*(Cu+Cl));//second break frequency
+ BW=F1;//since single common emitter amplifier so n=1 thus BW=F1*sqrt(2^(1/n)-1),i.e.,BW=F1
+ Avmid=-gm*Rl;//mid frequency gain
+ GBW=Avmid*BW;// gain-bandwidth product
+ disp('********For Rl=100 Ohm********')
+ disp('MHz',F1/10^6,'first break frequency is:')
+ disp('MHz',F2/10^6,'second break frequency is:')
+ disp('MHz',BW/10^6,'Bandwidth is:')
+ disp(abs(Avmid),'mid frequency gain is:')
+ disp('MHz',abs(GBW)/10^6,'gain-bandwidth product is:')
+ end
+end
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