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the ideal circuit model of fully differential opamp

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flyerwolf

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I am trying to design a MDAC, which contains a S/H circuit and a fully differential opamp. For the first step, I want to start with ideal switches and an ideal Opamp(voltage controlled current source with RL and CL). But I don't know how to represent a ideal fully differential Opamp with VCCS, using only one or two? Should I consider the common mode feedback in this condition? By the way, the software I use is ADS. Thanks a lot!
 

Why do you need to represent an ideal fully differential amplifier with Voltage Controlled Current Sources (VCCS)? You can use a Voltage Controlled Voltage Source (VCVS), which is fully differential (in and out). Maybe you need to upload a block diagram of your Multiplying DAC, so that we can understand better what you are trying to do.
 
Thank you for your guys. I have tried VCVS, but I still cannot get to the 6dB theoretically. I don't know why. Here are my MDAC structure circuit and my ideal simulation circuit. Thanks:)
 

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