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JFET Buffer Bias Calculator

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A JFET buffer (Common Drain Amplifier) is useful in that it has extremely high input resistance as compared to a BJT buffer.  The input resistance is equal to RG, which is typically very large, on the order of 1M ohm. 



N-Channel JFET Buffer

Figure 1 - N-Channel JFET Buffer

N-Channel JFET Buffer Bias
Desired VRS  (V)
Vp or VGS(off) (Pinch off Voltage, negative) (V)
IDSS (Zero Gate Voltage Drain Current)  (mA)

IDS (mA)
RS (ohms)
VGS (V) 





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