Linearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization

A linearity enhancement scheme for voltage-controlled oscillator (VCO)-based continuous-time (CT) delta-sigma (ΔΣ) analog-to-digital converters (ADCs) is proposed. Unlike conventional input feedforwarding techniques, the proposed feedforwarding scheme using digital feedback residue quantization (DFR...

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Autores principales:	Moo-Yeol Choi, Bai-Sun Kong
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	analog-to-digital converter delta-sigma ADC VCO-based quantizer input feedforward Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/83029ae394ea4c82b8dc1a824f148455
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spelling	oai:doaj.org-article:83029ae394ea4c82b8dc1a824f1484552021-11-25T17:24:32ZLinearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization10.3390/electronics102227732079-9292https://doaj.org/article/83029ae394ea4c82b8dc1a824f1484552021-11-01T00:00:00Zhttps://www.mdpi.com/2079-9292/10/22/2773https://doaj.org/toc/2079-9292A linearity enhancement scheme for voltage-controlled oscillator (VCO)-based continuous-time (CT) delta-sigma (ΔΣ) analog-to-digital converters (ADCs) is proposed. Unlike conventional input feedforwarding techniques, the proposed feedforwarding scheme using digital feedback residue quantization (DFRQ) can avoid the analog summing amplifier, allow intrinsic anti-aliasing filtering (AAF) characteristic, and cause no switching noise injection into the input. A VCO-based CT ΔΣ ADC adapting the proposed DFRQ enables residue-only processing in the quantizer, avoiding the degradation of signal-to-noise and distortion ratio (SNDR) due to VCO nonlinearity. The use of DFRQ also reduces the voltage swing of integrators without the drawbacks caused by conventional input feedforwarding techniques. The performance evaluation results indicate that the proposed VCO-based CT ΔΣ ADC with DFRQ provides 30.3-dB SNDR improvement, reaching up to 83.5-dB in 2-MHz signal bandwidth.Moo-Yeol ChoiBai-Sun KongMDPI AGarticleanalog-to-digital converterdelta-sigma ADCVCO-based quantizerinput feedforwardElectronicsTK7800-8360ENElectronics, Vol 10, Iss 2773, p 2773 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	analog-to-digital converter delta-sigma ADC VCO-based quantizer input feedforward Electronics TK7800-8360
spellingShingle	analog-to-digital converter delta-sigma ADC VCO-based quantizer input feedforward Electronics TK7800-8360 Moo-Yeol Choi Bai-Sun Kong Linearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization
description	A linearity enhancement scheme for voltage-controlled oscillator (VCO)-based continuous-time (CT) delta-sigma (ΔΣ) analog-to-digital converters (ADCs) is proposed. Unlike conventional input feedforwarding techniques, the proposed feedforwarding scheme using digital feedback residue quantization (DFRQ) can avoid the analog summing amplifier, allow intrinsic anti-aliasing filtering (AAF) characteristic, and cause no switching noise injection into the input. A VCO-based CT ΔΣ ADC adapting the proposed DFRQ enables residue-only processing in the quantizer, avoiding the degradation of signal-to-noise and distortion ratio (SNDR) due to VCO nonlinearity. The use of DFRQ also reduces the voltage swing of integrators without the drawbacks caused by conventional input feedforwarding techniques. The performance evaluation results indicate that the proposed VCO-based CT ΔΣ ADC with DFRQ provides 30.3-dB SNDR improvement, reaching up to 83.5-dB in 2-MHz signal bandwidth.
format	article
author	Moo-Yeol Choi Bai-Sun Kong
author_facet	Moo-Yeol Choi Bai-Sun Kong
author_sort	Moo-Yeol Choi
title	Linearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization
title_short	Linearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization
title_full	Linearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization
title_fullStr	Linearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization
title_full_unstemmed	Linearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization
title_sort	linearity enhancement of vco-based continuous-time delta-sigma adcs using digital feedback residue quantization
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/83029ae394ea4c82b8dc1a824f148455
work_keys_str_mv	AT mooyeolchoi linearityenhancementofvcobasedcontinuoustimedeltasigmaadcsusingdigitalfeedbackresiduequantization AT baisunkong linearityenhancementofvcobasedcontinuoustimedeltasigmaadcsusingdigitalfeedbackresiduequantization
_version_	1718412418512584704

Linearity Enhancement of VCO-Based Continuous-Time Delta-Sigma ADCs Using Digital Feedback Residue Quantization

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