Multisim simulation error

I am encountering an error while simulating AD636, ADG407 and AD623. I even tried to use ADI Multisim AD Edition but still receiving the same type of error. These multisim symbols are downloaded from Analog Devices website.
I have provided the following links to gain access to the error log files and screen capture of the circuit.
AD636 simulation error, multisim failed to resolve the problem using convergence assistant:
http://www.engineers.auckland.ac.nz/~htar006/error/ad636/capture.jpg
http://www.engineers.auckland.ac.nz/~htar006/error/ad636/Circuit2.ms10
http://www.engineers.auckland.ac.nz/~htar006/error/ad636/simulation_log_file.log
ADG407 simulation error, also multisim failed to resolve the problem using convergence assistant:
http://www.engineers.auckland.ac.nz/~htar006/error/adg407/capture.jpg
http://www.engineers.auckland.ac.nz/~htar006/error/adg407/Circuit1.ms10
http://www.engineers.auckland.ac.nz/~htar006/error/adg407/simulation_log.log
AD626 output is clipped operating in single supply mode and biased in the middle of the supply voltage:
http://www.engineers.auckland.ac.nz/~htar006/error/ad626/capture.jpg
http://www.engineers.auckland.ac.nz/~htar006/error/ad626/Circuit4.ms10
and for the AD623
http://www.engineers.auckland.ac.nz/~htar006/error/ad623/capture.jpg
http://www.engineers.auckland.ac.nz/~htar006/error/ad623/Circuit6.ms10
http://www.engineers.auckland.ac.nz/~htar006/error/ad623/simulation_log.log
I hope anyone can help me clear out the problem.
Regards,
Harold
Attachments:
error.zip ‏993 KB

Hi Harold,
Circuit 2
Please use the attached model. The sqrt function is causing a problem with the current SPICE engine, you can replace sqrt with pwr () function and the model should behave the same.
Circuit 1.
You need to add a semi colon to indicate comment on the line shown below. Double click on the component and select Edit Model
R_VB_C 422 500 1E6 components on these nodes
Circuit 4.
I believe this is a model issue. There are many models that were not designed to work single power supply and I believe is the case here.
Circuit 6.
I ran the circuit in ADI edition and also 10.0.1 and was not able to replicate the simulation error.
Tien P.
National Instruments
Attachments:
AD636.txt ‏4 KB

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