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the ideal model of fully differential opamp in ADS

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impulse123

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I am trying to design a Programmable Gain Amplifier, which contains resistive feedback 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 in ADS? Should I consider the common mode feedback in this condition. Thanks a lot!
 

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