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A structure of cascading multi-bit modulators without dynamic element matching or digital correction

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2 Author(s)
Bingxin Li ; LECS Lab., R. Inst. of Technol., Kista, Sweden ; Tenhunen, H.

A new structure of cascading multi-bit Sigma Delta modulators is proposed in this paper. Using a multi-bit quantizer in each stage, the modulator's performance is largely improved. Furthermore this structure does not require any dynamic element matching or digital correction circuit to attenuate the non-linearity error. This is because the modulator's first stage uses a multi-bit quantizer, but only the most significant bit is used to generate the feedback. By this way the non-linearity error is eliminated. Simulation results are demonstrated with circuit non-idealities considered.

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Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on  (Volume:3 )

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