An improved Random Swapping Thermometer Coding (RSTC) Dynamic Element Matching (DEM) method

An improved Random Swapping Thermometer Coding (RSTC) Dynamic Element Matching (DEM) method is presented for Nyquist-rate Digital to Analog converters (DACs). In contrast to the RSTC DEM method, the presented method prevents the Spurious-free dynamic range (SFDR) reduction in DACs in low signal freq...

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Vydáno v:International journal of electronics letters Ročník 9; číslo 3; s. 257 - 270
Hlavní autoři: Armuti, Mohammadreza, Bandali, Mehdi, Hashemipour, Omid
Médium: Journal Article
Jazyk:angličtina
Vydáno: Abingdon Taylor & Francis 03.07.2021
Taylor & Francis Ltd
Témata:
Coding
Data Converter
Digital to Analog Converter (DAC)
Digital to analog converters
Dynamic Element Matching (DEM)
Fast Fourier transformations
Fourier transforms
Low frequencies
Matching
Reduction
Sine waves
Spurious-free dynamic range (SFDR)
Switching activity
ISSN:2168-1724, 2168-1732
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Shrnutí:An improved Random Swapping Thermometer Coding (RSTC) Dynamic Element Matching (DEM) method is presented for Nyquist-rate Digital to Analog converters (DACs). In contrast to the RSTC DEM method, the presented method prevents the Spurious-free dynamic range (SFDR) reduction in DACs in low signal frequencies. Also, while "RSTC with the restricted jumping technique" method is unable to prevent the SFDR reduction in low frequencies for non-full-scale sinusoidal signals, this new method prevents the SFDR reduction in low frequencies for both full-scale and non-full-scale sinusoidal signals. The Fast fourier transform (FFT) analysis for a behavioural model of a 6-Bit thermometer coded DAC at ( is the signal frequency and is the sample rate) shows 2.1 dB SFDR improvement in comparison to "RSTC with the restricted jumping technique" method. In addition, the presented method achieves a reasonable trade-off between SFDR and Switching activity in comparison to other DEM methods.
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ISSN:2168-1724
2168-1732
DOI:10.1080/21681724.2020.1726477