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It's hard to say what's the structure inside AD6633.
But after seen the datasheet,you can find there are a error filter which use to simulate the channel filter response,and small nco which simulate nco combine.So I think all this used to generate an inverse signal to clip the peak value after NCO combination.
I believe this all are very similar to PMC's PM7819's waveshaper,you can find the waveshaper's patent in internet.
If anyone know more details,tell me too :roll:
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