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Effect of non-linear settling error on the harmonic distortion of fully-differential switched-current bandpass ΣΔ modulators

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5 Author(s)

This paper presents a detailed study of the effect of the non-linear settling on the harmonic distortion of Bandpass ΣΔ Modulators (BP-ΣΔMs) realized using Fully Differential (FD) Switched-current (SI) circuits. Based on the analysis of building blocks, closed-form expressions are derived for the third-order intermodulation distortion of BP-ΣΔMs due to defective settling, on the one hand, and to the non-linearities of the sampling process, on the other. Time-domain simulations and measurements taken from a 0.8 μm CMOS 4th-order BP-ΣΔM silicon prototype validate our approach

Published in:

Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on  (Volume:1 )

Date of Conference:

6-9 May 2001