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A second order mult...
A second order multi-bit Sigma Delta modulator with single-bit feedback
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- Li, B. X. (author)
- KTH,Elektroniksystemkonstruktion
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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. ; 38:1, s. 63-72
- 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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- Multi-bit Sigma Delta modulators suffer from the DAC non-linearity problem and often need complicated Dynamic Element Matching (DEM) circuits. Combining a multi-bit quantizer and a single-bit DAC eliminates the need of DEM circuits, simplifies the design, and reduces the power consumption. Using a digital circuit to compensate the truncation error caused by cutting the multi-bit feedback to single-bit, the structure can achieve the same noise transfer function as a conventional multi-bit modulator. One drawback is that the signal scaling in such a structure lowers the overall resolution. In this paper the influence of signal scaling is analyzed and a design example given. A second order 3-bit modulator is fabricated in 0.35 mum CMOS process, achieving 82 dB dynamic range at OSR 128 and a peak SNDR of 73.1 dB.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- sigma
- delta
- scaling
- SNDR
- modulation
- a/d converter
- adc
Publication and Content Type
- ref (subject category)
- art (subject category)
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