sheldon
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Jefkat,
Building high level models should be possible, it can also be done ADE/Spectre. Only a few primitive cells are required: delay, summer, gain, and quantizer should be enough, as loose-electron pointed out. Using this approach you should be able to directly realize the target transfer function and build anything you need. In the attached sample is a second-order loop. Using this approach, I have built first order, second order, third-order MASH, band-pass, etc. They all work and show the expected behavior.
Best Regards,
Sheldon
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