PSPICE ABM question
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Posted by Mathias on March 14, 2007, 11:31 am
Please log in for more thread options Dear ng, Is there a way to build a programmable (nonlinear) resistor in pspice? I currently use an ABM1 block as an input-voltage-dependent voltage source. This works fine on the output side, but it doesn't "consume" any current on its input side as a real resistor would. Thanks for any suggestion, Mathias | ||||||||||||||||||||||||||||
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Posted by Jim Thompson on March 14, 2007, 12:18 pm
Please log in for more thread options On Wed, 14 Mar 2007 16:31:42 +0100, Mathias You should be using GVALUE or GTABLE. Then you tie outputs back to inputs to get it to "consume" current. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. | ||||||||||||||||||||||||||||
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Posted by Mathias on March 14, 2007, 1:27 pm
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Hi Jim, i think i could use it in the "native spice text input file", but I'm lost when trying to use it in pspice's Schematics graphical layout tool. Maybe I'd have to define a specific "part" in a textfile and import it into Schematics? Thanks, Mathias Jim Thompson wrote: > On Wed, 14 Mar 2007 16:31:42 +0100, Mathias
> >> Dear ng,
>> >> Is there a way to build a programmable (nonlinear) resistor in pspice? >> I currently use an ABM1 block as an input-voltage-dependent voltage >> source. This works fine on the output side, but it doesn't "consume" any >> current on its input side as a real resistor would. >> >> Thanks for any suggestion, >> Mathias >
> You should be using GVALUE or GTABLE. Then you tie outputs back to > inputs to get it to "consume" current. > > ...Jim Thompson | ||||||||||||||||||||||||||||
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Posted by Jim Thompson on March 14, 2007, 1:57 pm
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On Wed, 14 Mar 2007 18:27:59 +0100, Mathias >Hi Jim,
> >i think i could use it in the "native spice text input file", but I'm >lost when trying to use it in pspice's Schematics graphical layout tool. What version are you using? PSpice Schematics or Capture (gag me with a spoon ?:-) I don't remember now when GVALUE first appeared. What happens if you "Get Part, GVALUE" ? >Maybe I'd have to define a specific "part" in a textfile and import it
>into Schematics? > >Thanks, > Mathias You can make almost anything up using .SUBCKT definition and POLY notation, if your version lacks ABM's.... I'm slow this morning, you do say "ABM1", so I'm sure you have GVALUE. GVALUE/EVALUE devices accept Algebraic expressions. >
>Jim Thompson wrote: >> On Wed, 14 Mar 2007 16:31:42 +0100, Mathias
>> >>> Dear ng,
>>> >>> Is there a way to build a programmable (nonlinear) resistor in pspice? >>> I currently use an ABM1 block as an input-voltage-dependent voltage >>> source. This works fine on the output side, but it doesn't "consume" any >>> current on its input side as a real resistor would. >>> >>> Thanks for any suggestion, >>> Mathias >>
>> You should be using GVALUE or GTABLE. Then you tie outputs back to >> inputs to get it to "consume" current. >> >> ...Jim Thompson ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. | ||||||||||||||||||||||||||||
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Posted by Mathias on March 14, 2007, 2:45 pm
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No! It's me who gets sleepy in the evening, you seem already bright awake ;) I always prefiltered for parts including "ABM", no wonder I couldn't find the GVALUE. Thanks a lot! Mathias > What version are you using? PSpice Schematics or Capture (gag me with
> a spoon ?:-) > > I don't remember now when GVALUE first appeared. > > What happens if you "Get Part, GVALUE" ? > >> Maybe I'd have to define a specific "part" in a textfile and import it
>> into Schematics? >> >> Thanks, >> Mathias >
> You can make almost anything up using .SUBCKT definition and POLY > notation, if your version lacks ABM's.... > > I'm slow this morning, you do say "ABM1", so I'm sure you have GVALUE. > > GVALUE/EVALUE devices accept Algebraic expressions. | ||||||||||||||||||||||||||||
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>
>Is there a way to build a programmable (nonlinear) resistor in pspice?
>I currently use an ABM1 block as an input-voltage-dependent voltage
>source. This works fine on the output side, but it doesn't "consume" any
>current on its input side as a real resistor would.
>
>Thanks for any suggestion,
> Mathias