Plot value of resistor in electrothermal circuit

Question

I want to plot the "equivalent" value of a resistor that uses electrothermal model

* Dummy SPICE netlist
R1 net1 net2 1 TC = -0.01

I can do it with a .defwave, but this is prone to numerical errors if V or I are small, close to 0.

* Dummy SPICE netlist
R1 net1 net2 1 TC = -0.01
.defwave resistor=V(net1,net2)/I(R1)

But how to do it with an .extract ?

* Dummy SPICE netlist
R1 net1 net2 1 TC = -0.01
.extract label=resistor2 unit=Ohm yval(R1) ! <- yval(??)

Currently it doesn't work, as R1 seems to be understand as a parameter, and not the resistor device

I used the analog spice simulator eldo. Not sure of what a package is imho — PTRK, Jan 14 '23 at 18:32

score 2 · Accepted Answer · answered Jan 13 '23 at 16:02

2

We can do it using the E operator (eval operator) in a .plot

.plot tran E(R1,R)

The E(INST,PARAM) evaluates (E[VAL]) the parameters of the requested instance/device and plots it

answered Jan 13 '23 at 16:02

PTRK

1 Answers1