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converting input to a Jfet

Discussion in 'General Electronics Discussion' started by DuctDuck, Jan 26, 2013.

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  1. DuctDuck

    DuctDuck

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    Jan 26, 2013
    Good morning...I have some simple help with n-Jfet biasing and behavior.

    I desire a highly resistive (6.0 Gohm>) input terminal to an electrometer; to capture Coulombs from the capacitor for a voltage at the Fet's gate. I have started with an open-drain amplifier (see below).

    [​IMG]
    ...thank you Digikey SchemeIt :)

    Can I use -VSS to setup a drain current?

    Looks like VG= -GSS, for VGS=0...ID(sat)?

    But, does gate resistance increase as -Vss "increases" (more Vneg)?

    Thanks in advance!

    -ps. I would like to see Vneg at the capacitor before the meter starts processing
     
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