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 |
| Language: | English |
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MDPI AG
2018-01-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/2/393 |
| _version_ | 1798034384868081664 |
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| author | Zhanghao Yu Xi Yang SungWon Chung |
| author_facet | Zhanghao Yu Xi Yang SungWon Chung |
| author_sort | Zhanghao Yu |
| collection | DOAJ |
| 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-μm complementary metal–oxide–semiconductor (CMOS) with a 400-fF compensation capacitor occupies 900- μ m 2 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 μ W 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. |
| first_indexed | 2024-04-11T20:43:35Z |
| format | Article |
| id | doaj.art-8b97bcba676945509c1516c42058879e |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T20:43:35Z |
| publishDate | 2018-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-8b97bcba676945509c1516c42058879e2022-12-22T04:04:07ZengMDPI AGSensors1424-82202018-01-0118239310.3390/s18020393s18020393A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer InterfaceZhanghao Yu0Xi Yang1SungWon Chung2Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USADepartment of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USADepartment of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USAHigh-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-μm complementary metal–oxide–semiconductor (CMOS) with a 400-fF compensation capacitor occupies 900- μ m 2 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 μ W 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.http://www.mdpi.com/1424-8220/18/2/393analog integrated circuitsoperational amplifierstransducer interface circuitInternet of Things (IoT) device |
| spellingShingle | Zhanghao Yu Xi Yang SungWon Chung A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface Sensors analog integrated circuits operational amplifiers transducer interface circuit Internet of Things (IoT) device |
| 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 |
| topic | analog integrated circuits operational amplifiers transducer interface circuit Internet of Things (IoT) device |
| url | http://www.mdpi.com/1424-8220/18/2/393 |
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