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#1 Aug 1, 2017
Last seen: 2 years 5 months ago
Joined: 2016-11-28 19:11

Modifing Spice Models such as Rbreak

Hi All,

I am trying to use the Rbreak part and changed the spice model to include "DEV=10%" for example. I added another Rbreak from the root library instead of the design cache and changed its model to include "DEV=1%". Checking on the first resistor I had it had changed the "DEV=10%" to "DEV=1%".

I am still a bit new at pspice but, does anyone know how I am suppose to be able to use multiple verisions of the Rbreak resistor?

Note: my end goal is to have the 'DEV' parameter point to a variable like: "DEV={Rtol_1E}". Then have the Rtol_1E be defined in the PARAM block show it shows up in the schematic nice and easy to see and change. This is why I am using the Rbreak instead of the R/analog model which I found cadence did not like the {Rtol_1E} in the tolerance field.

Thanks for the help!


Wed, 2017-08-02 03:51
RobertoGb's picture
Last seen: 1 year 7 months ago
Joined: 2016-05-24 03:10

Hello Michael,

If you want to use break resistors with different tolerances, you should have to change the implementation name. In your case, you want to use a resistor with DEV=10% and the other with DEV=1%. Then you would use Rbreak like that:

.model R_first RES R=1 Dev=10%

.model R_second RES R=1 Dev=1%

On the other hand, you can also use global parameters:

.model R_first RES R=1 Dev={TOL_1}

.model R_second RES R=1 Dev={TOL_2}

Just as extra information, to see the library, just select the breakout resistor and with right mouse button select Edit PSpice Model.

I hope it helps.



Wed, 2017-08-02 11:30
Last seen: 2 years 5 months ago
Joined: 2016-11-28 19:11

Thanks Roberto! I got that implemented now and it is working fine.


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