JFET Output Characteristics

I_D = f(V_DS, V_GS) · N-Channel JFET · I_DSS = 10 mA · V_P = -4 V

V_DS →

I_D ↑

V_GS ↗

Display

V_GS Curve Range

-3.0 V→0.0 V

Min V_GS

Max V_GS

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Operating Point Probe

V_DS

8.0

V_GS

-1.0

I_D

5.63

◉ SATURATION REGION

V_DS8.0 V

V_GS-1.0 V

JFET Equations

Saturation

I_D = I_DSS(1 − V_GS/V_P)²

Linear / Triode

I_D = (I_DSS/V_P²)(2(V_GS−V_P)V_DS − V_DS²)

Pinch-off boundary

V_DS = V_GS − V_P

I_D0 mA

10 mA╌ ╌ pinch-off boundary━