Cargando…
Linearity Enhancement Techniques for PGA Design
This paper presents some techniques to improve the linearity of traditional resistive feedback PGAs. By utilizing the switched op-amp in the PGA, the MOS switches in the feedback resistor array can be eliminated and thus the PGA’s linearity can be improved. The PGA’s linearity is further improved wi...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9963564/ https://www.ncbi.nlm.nih.gov/pubmed/36838057 http://dx.doi.org/10.3390/mi14020356 |
_version_ | 1784896283312390144 |
---|---|
author | Wang, Yujun Wang, Yi Wan, Lixi Jin, Zhi |
author_facet | Wang, Yujun Wang, Yi Wan, Lixi Jin, Zhi |
author_sort | Wang, Yujun |
collection | PubMed |
description | This paper presents some techniques to improve the linearity of traditional resistive feedback PGAs. By utilizing the switched op-amp in the PGA, the MOS switches in the feedback resistor array can be eliminated and thus the PGA’s linearity can be improved. The PGA’s linearity is further improved with an additional capacitor, which is used for pre-charging the sampling capacitor to strengthen its capability to drive the sampling capacitor without any extra power consumption. The pre-charge technique is especially suitable for the case where the PGA drives a large sampling capacitance. Implemented in SMIC 0.18 um CMOS technology, the proposed PGA can achieve a gain of 0.5 or 1 and consumes 4.68 mW at a single 5 V supply with the switched output stage enabled. When driving a 20 pF sampling capacitor at a sampling frequency of 200 kHz, the simulation results show that the proposed PGA can give a 9 dBc improvement in SFDR of the sampled signal compared to the traditional PGA design and the SFDR can reach up to 114 dBc. |
format | Online Article Text |
id | pubmed-9963564 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-99635642023-02-26 Linearity Enhancement Techniques for PGA Design Wang, Yujun Wang, Yi Wan, Lixi Jin, Zhi Micromachines (Basel) Article This paper presents some techniques to improve the linearity of traditional resistive feedback PGAs. By utilizing the switched op-amp in the PGA, the MOS switches in the feedback resistor array can be eliminated and thus the PGA’s linearity can be improved. The PGA’s linearity is further improved with an additional capacitor, which is used for pre-charging the sampling capacitor to strengthen its capability to drive the sampling capacitor without any extra power consumption. The pre-charge technique is especially suitable for the case where the PGA drives a large sampling capacitance. Implemented in SMIC 0.18 um CMOS technology, the proposed PGA can achieve a gain of 0.5 or 1 and consumes 4.68 mW at a single 5 V supply with the switched output stage enabled. When driving a 20 pF sampling capacitor at a sampling frequency of 200 kHz, the simulation results show that the proposed PGA can give a 9 dBc improvement in SFDR of the sampled signal compared to the traditional PGA design and the SFDR can reach up to 114 dBc. MDPI 2023-01-31 /pmc/articles/PMC9963564/ /pubmed/36838057 http://dx.doi.org/10.3390/mi14020356 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Yujun Wang, Yi Wan, Lixi Jin, Zhi Linearity Enhancement Techniques for PGA Design |
title | Linearity Enhancement Techniques for PGA Design |
title_full | Linearity Enhancement Techniques for PGA Design |
title_fullStr | Linearity Enhancement Techniques for PGA Design |
title_full_unstemmed | Linearity Enhancement Techniques for PGA Design |
title_short | Linearity Enhancement Techniques for PGA Design |
title_sort | linearity enhancement techniques for pga design |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9963564/ https://www.ncbi.nlm.nih.gov/pubmed/36838057 http://dx.doi.org/10.3390/mi14020356 |
work_keys_str_mv | AT wangyujun linearityenhancementtechniquesforpgadesign AT wangyi linearityenhancementtechniquesforpgadesign AT wanlixi linearityenhancementtechniquesforpgadesign AT jinzhi linearityenhancementtechniquesforpgadesign |