Error during LTSpice transient simulation

Hi qojote ,

Good day. Can you check the LTSpice version just to see if it is updated?

Hi PaulCA ,

Good day. Can you help us check the issue encountered?

Hi.

I updated to LTSpice 24.1.5 and the same issue persists.

BR

Hello qojote,

It looks like a SPICE model issue. I will move this query to the LTspice Forum. Someone there should be able to assist you better.

Regards,
Paul

qojote  Will you please attach your simulation files, including the schematic (.asc), symbol (.asy), and model (.cir) files?

Hi. Of course. Please find those files attached. BR

ad8330_simu.zip

Hello qojote and AnneM,

I have done some simulations on my end, and it looks like the model was able to output the correct output signal level by connecting the OFST pin to GND and by floating the MODE pin (normal operating condition).  In my simulation, 500mV is applied to the VDBS pin, which translates to a gain of 16.67dB or 6.8V/V. Multiplying the input voltage of 250mVpk to the Gain, the calculated peak output voltage should be 1.7Vpk, and this is similar to what I have simulated below. But, as can be seen below, there is still an error that says "ERROR: Node u1:n662042 is floating and connected to current source u1:G_G2".

  


Moving forward, when there is a 330nF cap connected to the OFST pin or the OFST pin is floating, the SPICE model wasn't able to produce an output and the Error shown below also appears:




According to the data sheet, the part should still run even if the OFST pin is floating (offset compensation feature is enabled) or a capacitor is added from OFST to CNTR, but based on the simulations above, the SPICE model is not giving any output. From the looks of it (just a hypothesis), the floating node from the simulation error is related to the OFST pin (offset compensation feature) of the SPICE model. I'll be submitting an internal request to get the AD8330 SPICE model fixed.



  

Best regards,
Paul