A new zero-optimization scheme for noise-coupled ΔΣ ADCs

Author

Zanbaghi, Ramin ; Fiez, Terri S. ; Temes, Gabor

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Oregon State Univ., Corvallis, OR, USA

fYear

2010

fDate

May 30 2010-June 2 2010

Firstpage

2163

Lastpage

2166

Abstract

This paper presents a new zero-optimization scheme for noise-coupled ΔΣ analog-to-digital converters (ADCs). The proposed technique enhances the signal-to-quantization-noise-ratio (SQNR) by optimizing noise-transfer-function (NTF) zero locations to get maximum in-band noise shaping. The amount of SQNR improvement using the new scheme depends on the order of the modulator. Therefore, zero optimization will be used in a first-order and a second-order modified noise-coupled ΔΣ ADCs. The proposed technique enhances the SQNR of the first-order and second-order noise-coupled ΔΣ modulators by 4.5dB and 8.5 dB, respectively.

Keywords

analogue-digital conversion; maximum in-band noise shaping; noise-coupled ΔΣ analog-to-digital converters; noise-transfer-function zero locations; signal-to-quantization-noise-ratio; zero-optimization scheme; Analog-digital conversion; Circuit noise; Computer science; Delta modulation; Feedforward systems; Filters; Noise shaping; Poles and zeros; Quantization; Signal resolution; NTF; delta-sigma modulator; loop filter; noise coupling; zero optimization;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on

Conference_Location

Paris

Print_ISBN

978-1-4244-5308-5

Electronic_ISBN

978-1-4244-5309-2

Type

conf

DOI

10.1109/ISCAS.2010.5537226

Filename

5537226