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+//Example9.7  // determine the lock range of the FSK demodulator
+clc;
+clear;
+close;
+Vcc = 12 ;
+Fvco = 0.25*Vcc ;
+f = 200*10^3 ; // KHz
+
+
+// the total time period of VCO 
+t = 1/f ;
+disp('The total time period of VCO is = '+string(t)+ ' sec ');
+
+// In VCO the capacitor charging and discharging time period are equal ,so the total time period of tringular and square wave forms can be written as 2*t ;
+
+
+// the charging or discharging time of capacitor 
+tcap = t/2 ;
+disp('The charging or discharging time of capacitor is = '+string(tcap)+ ' sec ');
+
+// the voltage swing of VCO for 12 V supply
+Fvco = 0.25*Vcc ;
+disp('The voltage swing of VCO for 12 V supply is = '+string(Fvco)+ ' V ');
+
+// The lock range of PLL 
+//FL = (1/2*%pi*f)*(Fvco/tcap);
+FL = (3/(2*%pi*f*tcap));
+disp('The lock range of PLL FL is = '+string(FL)+ ' Hz ');
+
+// the capture range 
+fcap = sqrt(f*FL);
+disp('The capture range is = '+string(fcap)+ ' Hz ');