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Combining Multipath and Single-Path Time-Interleaved Delta-Sigma Modulators

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2 Author(s)
Gharbiya, A. ; Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON ; Johns, D.A.

In this brief, single-path time-interleaved delta-sigma modulators are analyzed and evaluated. It is found that finite opamp gain and bandwidth result in a mismatch between the noise transfer functions of the internal quantizers which degrades the performance of the architecture. A hybrid topology where the first stage uses multiple integrators while the rest of the modulator uses a single path of integrators is proposed to mitigate the mismatch problem.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:55 ,  Issue: 12 )