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// chapter 13
// example 13.4
// page 279
Vcc=20 // V
Re=0 // kilo ohm, since given as negligible
Rc=10 // kilo ohm
Rl=30 // kilo ohm
Vbe=0.7 // V
Vce=10 // mV
Ic=1 // mA
// dc load line
// when Ic=0, Vce=Vcc i.e. Vce=15 and when Vce=0, Ic=Vcc/(Rc+Re) i.e. Ic=20/10 mA
// so equation of load line becomes Ic=-(1/10)*Vce+2
clf()
x=linspace(0,20,5)
y=-(1/10)*x+2
plot2d(x,y,style=3,rect=[0,0,21,6])
xtitle("dc load line-green ac load line-blue","collector emitter voltage(volts)","collector current(mA)")
// ac load line
R_AC=Rc*Rl/(Rc+Rl) // ac load
V_ce=Vce+Ic*R_AC // maximum collector emitter voltage
I_c=Ic+Vce/R_AC // maximum collector current
// the equation of ac load line in terms of V_ce and I_c becomes
x=linspace(0,V_ce,10)
y=-(I_c/V_ce)*x+I_c
plot2d(x,y,style=2,rect=[0,0,21,6])
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