Re: [SI-LIST] : Output Impedance

Kevin Weldon (kweldon@BayNetworks.COM)
Wed, 01 Apr 1998 12:58:30 -0500

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Hello Alaa,

What I do is connect the input node of the output buffer
to Vcc. Then I connect the output node to Vcc through
a resistor. Then I simply change the value of the resistor
until I measure Vcc/2 at the output node of the buffer. The
value of the resistor at this point is equal to the output impedance
of the buffer. HSpice's Goal Optimization works well for this.
Is there a simpler way to do this?

--
Kevin Weldon
Bay Networks
3 Federal St. BL3-02
Billerica, MA 01821

alaa alani wrote:

> Hi,
>
> What is the simplest way to measure the output impedance of a buffer
> given just a spice netlist?
>
> Thanks,
>
> Alaa Alani
> LSI Logic

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Hello Alaa,

  What I do is connect the input node of the output buffer
to Vcc.  Then I connect the output node to Vcc through
a resistor.  Then I simply change the value of the resistor
until I measure Vcc/2 at the output node of the buffer. The
value of the resistor at this point is equal to the output impedance
of the buffer.  HSpice's Goal Optimization works well for this.
    Is there a simpler way to do this?

 --
Kevin Weldon
Bay Networks
3 Federal St. BL3-02
Billerica, MA 01821

alaa alani wrote:

Hi,

What is the simplest way to measure the output impedance of a buffer
given just a spice netlist?

Thanks,

Alaa Alani
LSI Logic

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