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Low-pass to Band-pass Conversion(Continuous-time delta-sigma ADC)

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Guoke2000

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I have designed a low-pass continuous-time 4th order single-bit delta-sigma ADC, now I am trying to convert it into a bandpass complex ADC.

The problem I got is when I turned on the cross-coupling between I/Q(ideally the transfer function should shift to right by wc), my original coefficients are kept same, while some stages are saturated(my low-pass is fine). I tried a lot of times for changing the scale of coefficients, but it did not do much help.

Anybody has experience on this single-bit bandpass delta-sigma design? Appreciate for your help.
 

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