On Thu, Feb 6, 2025, 10:43 AM Mark Kahrs via <mark.kahrs=[email protected]> wrote:
You're having convergence issues.? Here's a PSPICE document that covers possible problems.
On Thu, Feb 6, 2025 at 2:48?AM Jerry Lee Marcel via <jerryleemarcel=[email protected]> wrote:
Usually multiple package opamps are treated as individuals, each
section being the typical +in, -in, out, V+ and V-. It does not
represent the actual topology, but for simulation purposes, it
does the jow fine.
I'm having fun with variations on the OPA Alice circuit and
would like to be able to model using SPICE in KiCAD. I found the
model on TI's website but it doesn't have the correct subcircuit
for a 1642, which has 8 pins. I modified that lib with the
following:
?
```
* Added by matthew to model the 8-pin OPA1642AID
.SUBCKT OPA1642AID OUT_A IN-_A IN+_A VEE IN+_B IN-_B OUT_B VCC
XU1 IN+_A IN-_A VCC VEE OUT_A OPA164x
XU2 IN+_B IN-_B VCC VEE OUT_B OPA164x
.ENDS OPA1642AID
```
I then made sure that the pins match the symbol in my schematic,
but when I tried to run an OP test, I got a bunch of warning and
errors. Before I go down the path of trying to trouble-shoot all
of this, does anyone have any experience with this who can offer
any advice for modeling the OPA Alice circuit??
PS. I'm very new to electronics. I am a software engineer and
have worked adjacent to and have even manage electrical
engineers but this is not my area of expertise.
