Hybrid SD modulators with adaptive calibration

This paper describes an architecture for stable high-order SD modulation. The architecture is based on a hybrid SD modulator, wherein hybrid integrators replace conventional analog integrators. The hybrid integrator, which is a combination of an analog integrator and a digital integrator, offers an increased dynamic range and helps make the resulting high-order SD modulator stable. However, the hybrid EA modulator relies on precise matching of analog and digital paths. In this paper, a calibration technique to alleviate possible mismatch between analog and digital paths is proposed. The calibration adaptively adjusts the digital integrators so that their transfer functions match the transfer functions of corresponding analog integrators. Through behavioral-level simulations of fourth-order SD modulators, the calibration technique is verified.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2005-05
Language
ENG
Keywords

SIGMA-DELTA MODULATION; LOCAL FEEDBACK LOOPS; DIGITAL CORRECTION; ANALOG ERRORS; MASH ADCS; CONVERTERS

Citation

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, v.52, no.5, pp.885 - 893

ISSN
1549-8328
URI
http://hdl.handle.net/10203/997
Appears in Collection
RIMS Journal Papers
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