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Optimization of the integrator output swing in low-voltage sigma-delta modulators

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2 Author(s)
Malcovati, P. ; Dept. of Electr. Eng., Pavia Univ. ; Maloberti, F.

This paper presents a technique which allows us to limit to 0.5 times the reference voltage the output swing of the first integrator in a sigma-delta (ΣΔ) modulator. The conventional ΣΔ modulator architecture is modified by replacing the global feedback path to the input of the first integrator with a local feedback. The overall performances of the modulator are maintained by restoring at the output of the first integrator the global feedback information by means of a simple additional circuit. The simulation and the experimental results obtained from a prototype implementing a second-order ΣΔ modulator validate the proposed approach

Published in:

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

Date of Conference:

6-9 May 2001