PSPICE ABM question

Mar 14, 2007 5 Replies

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

| 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.

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 Thomps> >

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" ?

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

| 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.

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

That pre-filtering can turn into a nuisance, not returning easily to a full list :-(

I awoke 5.5 hours ago... it's just now lunch time here ;-)

...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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