Title :
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
fDate :
May 30 2010-June 2 2010
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;
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
DOI :
10.1109/ISCAS.2010.5537226
