I would appreciate it if someone can help me with the following LTspice error.
SPICE ERROR LOG:
Error on line 3 : u1 v1 0 v2 fb vcc vee fb ad8130
Unable to find definition of model "fb"
* Unknown parameter "vcc"
Fatal Error: URC instance U1: Length must be positive definite.
I'm trying to simulate the summing circuit application that is shown in the AD8129/AD8130 Datasheet on page 35.
I have checked that my LTspice model pin list is in the same order as the "AD8130.cir" SUBCKT list.
R1 0 FB 1K tol=1 pwr=0.1
U1 V1 0 V2 FB VCC VEE FB AD8130
V1 V1 0 SINE(0 1 1K)
V2 V2 0 SINE(0 1 1K)
V3 VCC 0 12
V4 VEE 0 -12
I'm not sure if there is an error with the circuit or with my model. See the attached design files below.
The prefix in your symbol is wrong.Please open your symbol file(.asy) with the symbol editor and edit the attributes.You have set Prefix:U, but it has to be X.Prefix:XChange the prefix…
The prefix in your symbol is wrong.Please open your symbol file(.asy) with the symbol editor and edit the attributes.You have set Prefix:U, but it has to be X.Prefix:XChange the prefix-value to X and save the symbol. Then place it again in the schematic.
I have attached a zip-file with one of my examples.
Thank you. I completely overlooked this. I thought it was just the prefix for the part.
I have always subconsciously used X, not sure why I deferred from normal.
Extract from LTspice Help
The symbol's attributes can be overridden in the instance of the symbol
as a component in a schematic. For example, if you have a symbol for a
MOSFET with a prefix attribute of 'M',
it's possible to override the prefix to an 'X' on an
instance-by-instance basis so that the transistor can be modeled as
This article from Analog Devices also helped. Good to go back to basics - LTspice: Using an Intrinsic Symbol for a Third-Party Model