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elec2.plt
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1994-07-09
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837b
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# elec2.plt
# Electronics demo 2
#
paper size 11 by 8.5
format y 2
font 3
# Junction Field Effect Transistor (JFET) Mutual Characteristic
# drain current above pinch off
Ida(Vd)=Ido*(1-Vg/Vp)**2
# drain current below pinch off
Idb(Vd)=Ido*(2*Vd*(Vg-Vp)-Vd*Vd)/(Vp*Vp)
# drain current
Id(Vd)= (Vd>Vg-Vp) ? Ida(Vd) : Idb(Vd)
# drain current at zero gate voltage
Ido = 2.5
# pinch off voltage
Vp = -1.25
# gate voltage
Vg = 0
dummy Vd
title "JFET Mutual Characteristic"
map x 0 4 y 0 5
draw x y
frame
xlabel "Drain voltage Vd (V)"
ylabel "Drain current Id (mA)"
label "-0.5 Vp" at 4.5, 2.75
label "-0.25 Vp" at 4.5, 3.5
label "0" at 4.5, 4.5
label "Vg = 0.5 Vp" at 4.5, 6
color lred
plot Vg=0.5*Vp,Id(Vd),Vg=0.25*Vp,Id(Vd),Vg=0,Id(Vd),Vg=-0.25*Vp,Id(Vd)