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Design of semi-uniform quantizers and their application in sigma delta A/D converters
KTH, Tidigare Institutioner, Elektroniksystemkonstruktion.
2004 (Engelska)Ingår i: Analog Integrated Circuits and Signal Processing, ISSN 0925-1030, E-ISSN 1573-1979, Vol. 41, nr 03-feb, s. 253-267Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this paper a new type of non-uniform quantizer, semi-uniform quantizer, is introduced. A k-bit semi-uniform quantizer uses the thresholds defined by a (k+1)-bit uniform quantizer and arranges them in such a way that small-amplitude inputs will be quantized by small quantization steps and large-amplitude inputs by large quantization steps. Therefore the total quantization error power could be reduced and the modulator's dynamic range could be increased by 1-bit. The condition for a semi-uniform quantizer to achieve a better performance than a uniform quantizer is analyzed and verified using a second order 3-bit sigma delta modulator prototype chip, fabricated in 0.35 mum CMOS process. At 32 x oversampling ratio the modulator achieves 81 dB dynamic range and 63.8 dB peak SNDR with 3-bit semi-uniform quantizer. With 3-bit uniform quantizer the dynamic range is 70 dB and the peak SNDR is 54.1 dB.

Ort, förlag, år, upplaga, sidor
2004. Vol. 41, nr 03-feb, s. 253-267
Nyckelord [en]
sigma, delta, quantization, modulation, OTA, adc
Nationell ämneskategori
Datorsystem
Identifikatorer
URN: urn:nbn:se:kth:diva-23729DOI: 10.1023/B:ALOG.0000041640.63105.2dISI: 000223914200014Scopus ID: 2-s2.0-4544387928OAI: oai:DiVA.org:kth-23729DiVA, id: diva2:342428
Anmärkning

QC 20100525 QC 20110921. 9th IEEE International Conference on Electronics, Circuits and Systems, DUBROVNIK, CROATIA, SEP 15-18, 2002

Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2020-03-05Bibliografiskt granskad

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Li, B. X.Tenhunen, Hannu
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Elektroniksystemkonstruktion
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