Title :
Optimization of the integrator output swing in low-voltage sigma-delta modulators
Author :
Malcovati, Piero ; Maloberti, Franco
Author_Institution :
Dept. of Electr. Eng., Pavia Univ.
Abstract :
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
Keywords :
circuit feedback; circuit optimisation; integrating circuits; low-power electronics; sigma-delta modulation; global feedback path; integrator output swing; local feedback; low-voltage sigma-delta modulators; Capacitance; Circuits; Degradation; Delta-sigma modulation; Dynamic voltage scaling; Low voltage; Noise reduction; Operational amplifiers; Output feedback; Power supplies;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921929
