AnsweredAssumed Answered

Problem with AD8336 model in LTspice

Question asked by dmsonadi on Apr 10, 2018
Latest reply on May 10, 2018 by dmsonadi

I'm using LTspice to simulate a circuit, and could not get the published AD8336 model to work. I searched Google and EngineerZone, but it still won't work. I do not have a background in spice models, so this is difficult for me to debug. Hopefully it's something simple, I would really like to use this device.

 

  1. To debug this issue, I'm using AEi Systems' test circuit for the model (Figure 4.5 on p.6 of the PDF attached here: https://ez.analog.com/message/26195?commentID=26195#comment-27724)
  2. The published AD8336 model will make LTspice throw an error about unrecognized functions (nonzero and np). Other threads on Engineer Zone (AD8336 Simulation in PSPICE Issues, AD8336 with ADISimPE) include revised models, which do not have these errors.
  3. With the revised models, the pre-gain amp half works fine, but VOUT from the VGA does not have an output. It's not railed - here's just no signal.

 

Can someone please help me get to the bottom of this?

 

Thanks,
Dan

Attachments

Outcomes