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    JFET Buffer Bias Calculator

    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

    N-Channel JFET Buffer Bias
    VDD
    Desired VRS
    Vp or VGS(off) (Pinch off Voltage, negative)
    IDSS (Zero Gate Voltage Drain Current)
    Results
    IDS
    RS
    VGS

    Equations:

    IDS= IDSS(1-VGS/Vp)2

    RS= VRS/IDS

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