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diff --git a/728/CH9/EX9.9/Ex9_9.sce b/728/CH9/EX9.9/Ex9_9.sce
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+//Caption:Calculate the resonant frequency & efficiency.
+//Exa:9.9
+clc;
+clear;
+close;
+L_p=0.5*10^-9;//in H 
+C_j=0.5*10^-12;//in F
+V_bd=100;//breakdown voltage (in volts)
+I_bias=100*10^-3;//bias current(in A) 
+I_rf_peak=0.8;
+R_l=2;
+f=1/(2*%pi*sqrt(L_p*C_j));
+eff={(0.5*I_rf_peak^2*R_l)/(V_bd*I_bias)}*100;
+disp(f*10^-9,'Resonant frequency (in GHz) =');
+disp(eff,'Efficiency (in percentage) =');
+\ No newline at end of file