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+//Example6.28  // to determine the hysteresis width of a schmitt trigger

+clc;

+clear;

+close;

+R1 = 15*10^3 ; // ohm

+R2 = 90*10^3 ; // ohm

+VTH = 10 ; // V

+VTL = -10 ; // V

+

+// the upper crossover voltage of schmitt trigger is defined as

+VU = (R1/(R1+R2))*VTH;

+disp('the upper crossover voltage of schmitt trigger is = '+string(VU)+' V' );

+

+// the lower crossover voltage of schmitt trigger is defined as

+VL = (R1/(R1+R2))*VTL;

+disp('the lower crossover voltage of schmitt trigger is = '+string(VL)+' V' );

+

+// the hysteresis width of schmitt trigger is

+HW = VU-VL ;

+disp('the hysteresis width HW of schmitt trigger is = '+string(HW)+' V' );