Systematic design of double-sampling ΣΔ ADC´s with modified NTF

Author

Rombouts, P. ; De Maeyer, J. ; Raman, J. ; Weyten, L.

Author_Institution

Electron. & Inf. Syst., Ghent Univ., Gent, Belgium

Volume

1

fYear

2004

fDate

23-26 May 2004

Abstract

A disadvantage of double-sampling ΣΔ ADC´s is their sensitivity to path mismatch. Recently, an approach to solve this problem was presented. It consists of modifying the noise transfer function (NTF) of the modulator such that it has a zero at the Nyquist frequency, next to those in the baseband. Unfortunately, no systematic design strategy for such ADC´s is available. In this work, we present such a strategy. It consists of finding optimal pole positions for the modified NTF. This can be combined with optimizing the zeros of the NTF. Next, we introduce an efficient structure that has enough flexibility to realize the optimized pole positions.

Keywords

circuit noise; circuit optimisation; poles and zeros; sigma-delta modulation; transfer functions; ΣΔ ADC; NTF modification; Nyquist frequency zero; baseband; double-sampling; modified NTF; noise transfer function modification; optimal pole position; path mismatch sensitivity; systematic ADC design; zero optimization; Baseband; Capacitors; Circuits; Clocks; Frequency; Noise reduction; Noise shaping; Quantization; Sampling methods; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1328216

Filename

1328216