AD8338 LTSpice Question

Hi,

I imported the AD8338 spice model directly from the product page onto LTSpice and when I try to simulate a frequency response plot where I want to see the Gain (dB) Vs Frequency (Hz) plot. I get this error :

"ERROR: Node U1:VSLEW is floating and connected to current source B:U1:SLEW

Direct Newton iteration for .op point succeeded.
Ignoring empty pin current: Ix(u1:comm)
Ignoring empty pin current: Ix(u1:gain)
Ignoring empty pin current: Ix(u1:comm)
Ignoring empty pin current: Ix(u1:gain)

Date: Tue Feb 23 09:23:34 2021
Total elapsed time: 0.038 seconds.

tnom = 27
temp = 27
method = trap
totiter = 4
traniter = 0
tranpoints = 0
accept = 0
rejected = 0
matrix size = 29
fillins = 10
solver = Normal
Matrix Compiler1:      71 opcodes
Matrix Compiler2: 1.91 KB object code size"

Here's the simulation picture : https://imgur.com/a/9fjnhS6



Added simulation picture link
[edited by: Engineer101 at 4:34 PM (GMT -5) on 23 Feb 2021]
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  • 0
    •  Analog Employees 
    on Mar 1, 2021 5:53 AM

    Hi Engineer101,

    Can you try to add the underlined text at Line 64 of the netlist?  (I can't seem to upload files/images as of the moment to show you easily)

    C010 VSLEW 0 10e-12 IC = 1E-15

    "IC = 1E-15" gives this capacitor C010 initial charge and therefore won't mess up LTSpice's calculation. 

    I was able to run your schematic without any errors and was able to simulate Gain vs Frequency plot.
    Let me know if it works on your side.

    Thanks Engineer101.

    Best Regards,
    Dann

Reply
  • 0
    •  Analog Employees 
    on Mar 1, 2021 5:53 AM

    Hi Engineer101,

    Can you try to add the underlined text at Line 64 of the netlist?  (I can't seem to upload files/images as of the moment to show you easily)

    C010 VSLEW 0 10e-12 IC = 1E-15

    "IC = 1E-15" gives this capacitor C010 initial charge and therefore won't mess up LTSpice's calculation. 

    I was able to run your schematic without any errors and was able to simulate Gain vs Frequency plot.
    Let me know if it works on your side.

    Thanks Engineer101.

    Best Regards,
    Dann

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