Simulation not working for certain values on the Vgain pin

Question

I'm considering using the AD8337 in the design and would like to simulate the frequency response/bode plot. However when I set the Vgain to 0V or greater the simulations results show it acting as a big attenuator. For example when Vgain = -0.2V the circuit has around 8 dB of gain as expected. But when I test for Vgain = 0V or higher which is suppose to give higher gain than the circuit simulations fails and it has more than 200 dB of attenuation. 
 
 Thanks, 
 Sojhal

ADIApproved · Accepted Answer

Hello sojhalb , In addition to your circuit above, I've connected a 2.5V source to the VCOM pin as instructed on the data sheet to make sure that we are not missing something important when operating the part in single supply. But it looks like the SPICE model of AD8337 has a problem when being operated at a single supply and with a reference equal to half the +Vs. I'll submit a request to get the SPICE model fixed. For the meantime, you can try operating the SPICE model in dual supplies. Currently, the model seems to work with dual supplies and GND as a reference as shown below: Regards, Paul)

SLA Status	Assignee	Support Status
SLA Closed. Met after 49 hours	EarlJohn maaarmas MStokowski	Closed

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Simulation not working for certain values on the Vgain pin

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