I tried to simulate the voltage-controlled quadrature oscillator of the AD633 application note, using ADIsimPE, but it said there are too many analog nodes. I note that the model for this fairly old part hasn't been encryped yet. LT-Spice doesn't seem be able to start that kind of oscillator. That's a bit disappointing because there are only two multipliers in the circuit, and the parts are too expensive for someone in retirement to buy just for a try-out (I'm interested in music theory - simulating a monochord).
Verified Answer: RE: AD633 using ADIsimPE by ezadminThis question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.
Question: RE: AD633 using ADIsimPE by iamPhil
Sorry that you are having thi problem but i believe AD633 is already on the encrypted library under Model Library--> Multipliers. Please let me know if you can't still find it or have any concern.
Thanks for your reply. I went through quite a few categories in the Model Libraries, and the only entries that turned up the string ?@@--START ENCRYPTION: "ANALOG DEVICES ENCRYPTION" were some amplifiers like the AD8273. Some components in the Examples are also encrypted but I didn't find an example that uses a multiplier.
I was able to simulate cubing a sine wave with the simplest possible circuit using two AD633s, so I guess my project has just a few nodes too many. Fair enough for free software!
Thanks for your help,