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The AD8221 is a gain programmable, high performance instrumentation amplifier that delivers the industry’s highest CMRR over frequency in its class. The...
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ad8221 ltspice error

Cain

on Aug 1, 2024

Category: Software

Product Number: AD8221

Software Version: LTSPICE(x64) 24.0.12

Hi,

I'm simulating AD8221 in LTspice 24.0.12, the output was fine when there's no load on AD8221, but I got "singular matrix" error after adding a opamp buffer (tried ada4510/op2177/max44248) on the output node.

The simulation conditions are

Supply ±12V, Input VCM 2.5V, Input VDiff SINE(88m 138m 1), REF 623mV, RG 4.53k.

Could you please help me understand what is causing this simulation error? Thank you!

0 PaulCA

on Aug 4, 2024 10:08 PM
Hello Cain ,

Can you share your LTSpice schematic? Thank you.

Regards,
Paul
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0 Cain
on Aug 5, 2024 11:37 PM in reply to PaulCA
Hi, Paul

The schematic is attached below. The transient simulation works fine without the opamp buffer, but got singular matrix error after adding one.

Kind regards,

Cain
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0 GLADION

on Aug 7, 2024 2:19 AM in reply to Cain
Hi Cain ,

Good day. It seems that the error is due to some internal nodes of AD8221. I'll try to coordinate with our team for a possible fix. I have several part and it seems that there were parts where this issue persist. Thank you.

Regards,
Gilbeys
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