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Either Hogenauer got it wrong or you are doing something wrong.
Do you insert 7 zeros after every sample at the input to first Integrator?
Are you working at RTL level or matlab?
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Initially i am working at the matlab level .first i have inserted 9 stages of the comb filter and then upsampler of factor 8 i.e insering 7 zeros and then 9 stages of the integrator.The second integrator sum is showing the overflow problem.the input to the first integrator stage is 32 bit as obtained and the input to the second integrator is 34 bit.but the sum in the input to the input of the intgrator is overflowed.can you check the matlab code that i have sent to you and the Hogenauer's paper and compare where i am going wrong?
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