A 3.7-mW 12.5-MHz 81-dB SNDR 4th-Order Continuous-Time DSM With Single-OTA and 2nd-Order Noise-Shaping SAR
This article presents a hybrid 4th-order delta–sigma modulator (DSM). It combines a continuous-time (CT) loop filter and a discrete-time (DT) passive 2nd-order noise-shaping SAR (NS-SAR). Since the 2nd-order NS-SAR is robust against PVT variation, the stability of this 4th-order DSM is si...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2022-01-01
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| Series: | IEEE Open Journal of the Solid-State Circuits Society |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9913224/ |
| _version_ | 1797197382467715072 |
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| author | Wei Shi Jiaxin Liu Abhishek Mukherjee Xiangxing Yang Xiyuan Tang Linxiao Shen Wenda Zhao Nan Sun |
| author_facet | Wei Shi Jiaxin Liu Abhishek Mukherjee Xiangxing Yang Xiyuan Tang Linxiao Shen Wenda Zhao Nan Sun |
| author_sort | Wei Shi |
| collection | DOAJ |
| description | This article presents a hybrid 4th-order delta–sigma modulator (DSM). It combines a continuous-time (CT) loop filter and a discrete-time (DT) passive 2nd-order noise-shaping SAR (NS-SAR). Since the 2nd-order NS-SAR is robust against PVT variation, the stability of this 4th-order DSM is similar to that of a 2nd-order CT-DSM. The CT loop filter is based on single-amplifier–biquad (SAB) structure. As a result, only one OTA is used to achieve 4th-order noise shaping, leading to a high power efficiency. Moreover, this work implements both excess-loop delay (ELD) compensation and an input feedforward path inside the NS-SAR in the charge domain, further reducing the circuit complexity and the OTA power. Overall, this work achieves 81-dB SNDR over 12.5 MHz with 3.7-mW power, leading to a Schreier FoM of 176 dB. |
| first_indexed | 2024-04-24T06:43:05Z |
| format | Article |
| id | doaj.art-35d02b10d2cd47dcaee620560580f868 |
| institution | Directory Open Access Journal |
| issn | 2644-1349 |
| language | English |
| last_indexed | 2024-04-24T06:43:05Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of the Solid-State Circuits Society |
| spelling | doaj.art-35d02b10d2cd47dcaee620560580f8682024-04-22T20:40:07ZengIEEEIEEE Open Journal of the Solid-State Circuits Society2644-13492022-01-01212213410.1109/OJSSCS.2022.32123339913224A 3.7-mW 12.5-MHz 81-dB SNDR 4th-Order Continuous-Time DSM With Single-OTA and 2nd-Order Noise-Shaping SARWei Shi0https://orcid.org/0000-0001-9106-1092Jiaxin Liu1https://orcid.org/0000-0001-9204-3988Abhishek Mukherjee2https://orcid.org/0000-0002-5543-7870Xiangxing Yang3https://orcid.org/0000-0001-8712-2884Xiyuan Tang4https://orcid.org/0000-0003-2181-9042Linxiao Shen5https://orcid.org/0000-0001-7933-3673Wenda Zhao6https://orcid.org/0000-0002-1834-646XNan Sun7Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, USAInstitute of Integrated Circuits and Systems, University of Electronic Science and Technology of China, Chengdu, ChinaDepartment of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, USADepartment of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, USAInstitute for Artificial Intelligence and School of Integrated Circuit, Peking University, Beijing, ChinaSchool of Integrated Circuit, Peking University, Beijing, ChinaDepartment of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, USADepartment of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, USAThis article presents a hybrid 4th-order delta–sigma modulator (DSM). It combines a continuous-time (CT) loop filter and a discrete-time (DT) passive 2nd-order noise-shaping SAR (NS-SAR). Since the 2nd-order NS-SAR is robust against PVT variation, the stability of this 4th-order DSM is similar to that of a 2nd-order CT-DSM. The CT loop filter is based on single-amplifier–biquad (SAB) structure. As a result, only one OTA is used to achieve 4th-order noise shaping, leading to a high power efficiency. Moreover, this work implements both excess-loop delay (ELD) compensation and an input feedforward path inside the NS-SAR in the charge domain, further reducing the circuit complexity and the OTA power. Overall, this work achieves 81-dB SNDR over 12.5 MHz with 3.7-mW power, leading to a Schreier FoM of 176 dB.https://ieeexplore.ieee.org/document/9913224/Delta–sigma modulator (DSM)extra loop delay compensationhybridnoise-shaping SAR (NS-SAR) |
| spellingShingle | Wei Shi Jiaxin Liu Abhishek Mukherjee Xiangxing Yang Xiyuan Tang Linxiao Shen Wenda Zhao Nan Sun A 3.7-mW 12.5-MHz 81-dB SNDR 4th-Order Continuous-Time DSM With Single-OTA and 2nd-Order Noise-Shaping SAR IEEE Open Journal of the Solid-State Circuits Society Delta–sigma modulator (DSM) extra loop delay compensation hybrid noise-shaping SAR (NS-SAR) |
| title | A 3.7-mW 12.5-MHz 81-dB SNDR 4th-Order Continuous-Time DSM With Single-OTA and 2nd-Order Noise-Shaping SAR |
| title_full | A 3.7-mW 12.5-MHz 81-dB SNDR 4th-Order Continuous-Time DSM With Single-OTA and 2nd-Order Noise-Shaping SAR |
| title_fullStr | A 3.7-mW 12.5-MHz 81-dB SNDR 4th-Order Continuous-Time DSM With Single-OTA and 2nd-Order Noise-Shaping SAR |
| title_full_unstemmed | A 3.7-mW 12.5-MHz 81-dB SNDR 4th-Order Continuous-Time DSM With Single-OTA and 2nd-Order Noise-Shaping SAR |
| title_short | A 3.7-mW 12.5-MHz 81-dB SNDR 4th-Order Continuous-Time DSM With Single-OTA and 2nd-Order Noise-Shaping SAR |
| title_sort | 3 7 mw 12 5 mhz 81 db sndr 4th order continuous time dsm with single ota and 2nd order noise shaping sar |
| topic | Delta–sigma modulator (DSM) extra loop delay compensation hybrid noise-shaping SAR (NS-SAR) |
| url | https://ieeexplore.ieee.org/document/9913224/ |
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