This is a LTSpice model I created for a single electron transistor macro model:
.subckt SET 1 2 3
+pi=3.1415926535897932846
+CF1=40 ; 2CG/e
+CI2=0.2e-9
+CR2=100e+6
+CVp= 0.02
V2 5 3 DC CVp
V3 7 3 DC ‘-CVp’
D4 2 8 DIODE
D5 3 8 DIODE
RR1 1 3 R= ‘CR1+CR2*cos(CF1*pi*V(2,3))’
RR2 1 4 R= ‘CVp/(CI2-2*CVp/(CR1+CR2*cos(CF1*pi*V(2,3))))’
RR3 1 6 R= ‘CVp/(CI2-2*CVp/(CR1+CR2*cos(CF1*pi*V(2,3))))’
D2 4 5 DIODE
D3 7 6 DIODE
.MODEL DIODE D(N=0.01)
.ends
I got error message that symbols RR1
, RR2
, and RR3
are undefined. What does that error mean and why did I get it?
Best Answer
For most simulators the first line in any spice file should be an asterisk *, and is always a comment line.
I do not think you should put the R= part in the resistor definition lines. The lines should work fine like this:
For example:
If this does not work, try defining the expression as a parameter first:
then define resistor values like:
Also, it looks like in LTspice the .ends should have the subcircuit name afterwards, i.e.:
For particular nuances of each simulator check the documentation.