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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. 

Figure 1 - N-Channel JFET Buffer

Equations:

 I_DS= I_DSS(1-V_GS/Vp)²

 RS= V_RS/I_DS

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