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power-deprived analog clamp - anything?

Discussion in 'Electronic Components' started by Frank Miles, Sep 21, 2007.

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  1. Frank Miles

    Frank Miles Guest

    I have a small 3V-battery-operated device which has a switching power converter.
    The power converter gets turned off when not needed; when on, it generates
    two power supplies of ~ +/- 15V. Unfortunately, the analog output (much closer
    to a current source than a voltage source) running off the converted voltages
    emits transients on power-supply turn-on and turn-off. I need to clamp these
    transients to ground during this transition, without degrading the current-mode
    output during normal operation, and without taking up much board space, which
    is nearly as limited as the battery power.

    Simply turning off a series switch between source and load tends to upset the
    current source driver, making the eventual turn-on even more problematic.

    I haven't found any traditional analog switches that have the kind of power
    supply range (3V vs. 30+v). MOSFETs have those obnoxious parasitic diodes,
    and it would be ugly to control a pair of them (though it would work, albeit
    with series diodes that would prevent clamping tighter than a diode drop
    either side of ground).

    Is there something obvious that I'm missing? Some magical part that I have
    forgotten or simply didn't know about? Something small, simple, available,
    and low power? Sure, I can dream can't I?

    Thanks for any clues, hints, or commiseration!

    -f
     
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