Title :
A General Formulation of Analog-to-Digital Converters Using Parallel Sigma-Delta Modulators and Modulation Sequences
Author :
Blad, Anton ; Johansson, Håkan ; Löwenborg, Per
Author_Institution :
Electron. Syst., Linkoping Univ.
Abstract :
A formulation based on multirate theory is introduced for analog-to-digital converters using parallel sigma-delta modulators in conjunction with modulation sequences. It is shown how the formulation can be used to analyze a system´s sensitivity to channel mismatch errors by means of circulant and pseudo-circulant matrices. It is demonstrated how the time-interleaved-modulated (TIM), Hadamard-modulated (HM) and frequency-band decomposition (FBD) converters can be viewed as special cases of this more general description, and it is shown why the TIM and HM ADCs are sensitive to channel mismatch errors, whereas the FBD ADCs are not
Keywords :
sigma-delta modulation; Hadamard-modulated converters; analog-to-digital converters; channel mismatch errors; frequency-band decomposition converters; multirate theory; sigma-delta modulators; time-interleaved-modulated converters; Analog-digital conversion; Calibration; Delta modulation; Delta-sigma modulation; Digital filters; Frequency conversion; Matrix converters; Matrix decomposition; Noise shaping; Wideband; ADC; Hadamard; analog-to-digital; delta-sigma; modulation; modulator; multirate; parallel; sigma-delta; time-interleaved;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342483
