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AD633 noise SImetrix model doesn't match datasheet

Question asked by dhhsieh on Mar 24, 2017
Latest reply on Apr 19, 2017 by dhhsieh

Hi everyone, I am trying to do a noise simulation of a circuit using the AD633 low-cost analog multiplier. As a first check on my results, I have wired the multiplier in ADIsimPE (Simetrix) as in the attached file. When I run a noise simulation I get a flat noise spectrum of about 200nV/rtHz. However, the datasheet (also attached) shows a flat spectrum of 800nV/rtHz. I am wondering why this is so, since I have been able to get SImetrix models of op amps such as the AD797 and AD822 to approximately match their datasheet noise spectrums. Either 1) the SPICE model is out of date, 2) I didn't do the simulation right, or 3) the difference in noise spectrums isn't a big deal. Please let me know as soon as possible, thank you in advance for your support.