A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reduction
Abstract This letter presents a low‐noise implementation of the switched‐capacitor (SC) DC servo loop (DSL) in the capacitively coupled chopper instrumentation amplifier (CCIA). The noise of the SC integrator in SC DSL is first analyzed, then a low duty‐cycle subsampling and unbalanced capacitor rat...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-04-01
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| Series: | Electronics Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/ell2.12774 |
| _version_ | 1827968418717892608 |
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| author | Geng Mu Liangjian Lyu Dawei Ye C.‐J. Richard Shi |
| author_facet | Geng Mu Liangjian Lyu Dawei Ye C.‐J. Richard Shi |
| author_sort | Geng Mu |
| collection | DOAJ |
| description | Abstract This letter presents a low‐noise implementation of the switched‐capacitor (SC) DC servo loop (DSL) in the capacitively coupled chopper instrumentation amplifier (CCIA). The noise of the SC integrator in SC DSL is first analyzed, then a low duty‐cycle subsampling and unbalanced capacitor ratio are proposed to reduce the noise. Fabricated in a 65‐nm complementary metal‐oxide semiconductor (CMOS) process, the CCIA achieves 2.5 μVrms input‐referred noise, integrated from 0.5 to 250 Hz, and 110‐mV electrode‐DC offset (EDO) cancellation range. Besides, the calculated noise of the SC integrator well matches the measured, which proves the noise analysis. Compared with prior designs adopting similar SC integrators, this work reduces the noise level by 2× and increases the cancellation range by 2×. |
| first_indexed | 2024-04-09T18:22:25Z |
| format | Article |
| id | doaj.art-ac027a54df8043e1af94b626b08fb6a1 |
| institution | Directory Open Access Journal |
| issn | 0013-5194 1350-911X |
| language | English |
| last_indexed | 2024-04-09T18:22:25Z |
| publishDate | 2023-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Electronics Letters |
| spelling | doaj.art-ac027a54df8043e1af94b626b08fb6a12023-04-12T06:04:53ZengWileyElectronics Letters0013-51941350-911X2023-04-01597n/an/a10.1049/ell2.12774A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reductionGeng Mu0Liangjian Lyu1Dawei Ye2C.‐J. Richard Shi3Fudan University Shanghai ChinaEast China Normal University Shanghai ChinaHuazhong University of Science and Technology Wuhan ChinaUniversity of Washington Washington Seattle USAAbstract This letter presents a low‐noise implementation of the switched‐capacitor (SC) DC servo loop (DSL) in the capacitively coupled chopper instrumentation amplifier (CCIA). The noise of the SC integrator in SC DSL is first analyzed, then a low duty‐cycle subsampling and unbalanced capacitor ratio are proposed to reduce the noise. Fabricated in a 65‐nm complementary metal‐oxide semiconductor (CMOS) process, the CCIA achieves 2.5 μVrms input‐referred noise, integrated from 0.5 to 250 Hz, and 110‐mV electrode‐DC offset (EDO) cancellation range. Besides, the calculated noise of the SC integrator well matches the measured, which proves the noise analysis. Compared with prior designs adopting similar SC integrators, this work reduces the noise level by 2× and increases the cancellation range by 2×.https://doi.org/10.1049/ell2.12774choppers (circuits)instrumentation amplifiersswitched‐capacitor filters |
| spellingShingle | Geng Mu Liangjian Lyu Dawei Ye C.‐J. Richard Shi A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reduction Electronics Letters choppers (circuits) instrumentation amplifiers switched‐capacitor filters |
| title | A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reduction |
| title_full | A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reduction |
| title_fullStr | A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reduction |
| title_full_unstemmed | A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reduction |
| title_short | A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reduction |
| title_sort | chopper amplifier with a low duty cycle sub sampling in the switched capacitor integrator for noise reduction |
| topic | choppers (circuits) instrumentation amplifiers switched‐capacitor filters |
| url | https://doi.org/10.1049/ell2.12774 |
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