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Driving an Input to High Impedence in Hspice

Discussion in 'Electronic Basics' started by Sreekumar, Jun 20, 2004.

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  1. Sreekumar

    Sreekumar Guest


    I want to put an input of a gate to high impedence state (tristate or
    basically disconnect from vdd or gnd) at some point of time during the
    hspice simulation. I tried the manuals of Hspice and couldnt find
    information regarding this. I would be greatful if anyone could
    provide any help in this regard.


  2. Construct a discrete gate/buffer with transistors!

    Note that floating an output often results in simulation failure.
    Your'll probably have to have a large value resister to a dc node at the
    tri-state output.

    Kevin Aylward
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
  3. Jamie

    Jamie Guest

    you can if you don't mind inverting the input.
    place a simple NPN switching transitor there.
    C to your existing input, E to another Gate output
    to put the emiter to ground and the base will be your input.
    of you can use a Tri-State buffer..
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