A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface
High-resolution electronic interface circuits for transducers with nonlinear capacitive impedance need an operational amplifier, which is stable for a wide range of load capacitance. Such operational amplifier in a conventional design requires a large area for compensation capacitors, increasing cos...
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| Format: | Article |
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Multidisciplinary Digital Publishing Institute (MDPI)
2018
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| Online Access: | http://hdl.handle.net/1721.1/119362 https://orcid.org/0000-0002-5638-9428 |
| _version_ | 1826212593180606464 |
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| author | Yu, Zhanghao Yang, Xi Chung, SungWon |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Yu, Zhanghao Yang, Xi Chung, SungWon |
| author_sort | Yu, Zhanghao |
| collection | MIT |
| description | High-resolution electronic interface circuits for transducers with nonlinear capacitive impedance need an operational amplifier, which is stable for a wide range of load capacitance. Such operational amplifier in a conventional design requires a large area for compensation capacitors, increasing costs and limiting applications. In order to address this problem, we present a gain-boosted two-stage operational amplifier, whose frequency response compensation capacitor size is insensitive to the load capacitance and also orders of magnitude smaller compared to the conventional Miller-compensation capacitor that often dominates chip area. By exploiting pole-zero cancellation between a gain-boosting stage and the main amplifier stage, the compensation capacitor of the proposed operational amplifier becomes less dependent of load capacitance, so that it can also operate with a wide range of load capacitance. A prototype operational amplifier designed in 0.13-μ m complementary metal–oxide–semiconductor (CMOS) with a 400-fF compensation capacitor occupies 900-μ m² chip area and achieves 0.022–2.78-MHz unity gain bandwidth and over 65°phase margin with a load capacitance of 0.1–15 nF. The prototype amplifier consumes 7.6 μW from a single 1.0-V supply. For a given compensation capacitor size and a chip area, the prototype design demonstrates the best reported performance trade-off on unity gain bandwidth, maximum stable load capacitance, and power consumption. Keywords: analog integrated circuits; operational amplifiers; transducer interface circuit; Internet of Things (IoT) device |
| first_indexed | 2024-09-23T15:27:14Z |
| format | Article |
| id | mit-1721.1/119362 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T15:27:14Z |
| publishDate | 2018 |
| publisher | Multidisciplinary Digital Publishing Institute (MDPI) |
| record_format | dspace |
| spelling | mit-1721.1/1193622022-10-02T02:44:12Z A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface Yu, Zhanghao Yang, Xi Chung, SungWon Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Yang, Xi High-resolution electronic interface circuits for transducers with nonlinear capacitive impedance need an operational amplifier, which is stable for a wide range of load capacitance. Such operational amplifier in a conventional design requires a large area for compensation capacitors, increasing costs and limiting applications. In order to address this problem, we present a gain-boosted two-stage operational amplifier, whose frequency response compensation capacitor size is insensitive to the load capacitance and also orders of magnitude smaller compared to the conventional Miller-compensation capacitor that often dominates chip area. By exploiting pole-zero cancellation between a gain-boosting stage and the main amplifier stage, the compensation capacitor of the proposed operational amplifier becomes less dependent of load capacitance, so that it can also operate with a wide range of load capacitance. A prototype operational amplifier designed in 0.13-μ m complementary metal–oxide–semiconductor (CMOS) with a 400-fF compensation capacitor occupies 900-μ m² chip area and achieves 0.022–2.78-MHz unity gain bandwidth and over 65°phase margin with a load capacitance of 0.1–15 nF. The prototype amplifier consumes 7.6 μW from a single 1.0-V supply. For a given compensation capacitor size and a chip area, the prototype design demonstrates the best reported performance trade-off on unity gain bandwidth, maximum stable load capacitance, and power consumption. Keywords: analog integrated circuits; operational amplifiers; transducer interface circuit; Internet of Things (IoT) device 2018-11-29T14:51:08Z 2018-11-29T14:51:08Z 2018-01 2017-12 2018-11-22T14:25:02Z Article http://purl.org/eprint/type/JournalArticle 1424-8220 http://hdl.handle.net/1721.1/119362 Yu, Zhanghao et al. "A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface." Sensors 18, 2 (January 2018): 393 © 2018 The Authors https://orcid.org/0000-0002-5638-9428 http://dx.doi.org/10.3390/s18020393 Sensors Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Multidisciplinary Digital Publishing Institute (MDPI) Multidisciplinary Digital Publishing Institute |
| spellingShingle | Yu, Zhanghao Yang, Xi Chung, SungWon A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface |
| title | A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface |
| title_full | A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface |
| title_fullStr | A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface |
| title_full_unstemmed | A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface |
| title_short | A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface |
| title_sort | compact operational amplifier with load insensitive stability compensation for high precision transducer interface |
| url | http://hdl.handle.net/1721.1/119362 https://orcid.org/0000-0002-5638-9428 |
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