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Design of semi-unif...
Design of semi-uniform quantizers and their application in sigma delta A/D converters
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Li, B. X. (author)
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- Tenhunen, Hannu (author)
- KTH,Elektroniksystemkonstruktion
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(creator_code:org_t)
- 2004
- 2004
- English.
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In: Analog Integrated Circuits and Signal Processing. - 0925-1030 .- 1573-1979. ; 41:03-feb, s. 253-267
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Datorsystem (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Computer Systems (hsv//eng)
Keyword
- sigma
- delta
- quantization
- modulation
- OTA
- adc
Publication and Content Type
- ref (subject category)
- art (subject category)
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