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how to get the transfer function in the design of Sigma Delta Modulator?

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I am designing a 3-order single loop CT Sigma Delta Modultor with RZ DAC.But how can I get the NTF? I can get the NTF of the SDM with NRZ DAC. Mainly, the transfer function of z-domain to s-domain can not be transered using matlab command d2c or d2cm.Who can tell me the method? Thanks anyway.
 

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