Advances on CMOS Folded-Cascode Operational Transconductance
In this paper, a tutorial review on several structural improvements of the CMOS folded-cascode Operational Transconductance Amplifier (OTA) is presented. After a brief discussion on the structure and operation of the conventional Folded-Cascode Amplifier, its several architectural improvements are r...
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Amirkabir University of Technology
2022-12-01
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| Series: | AUT Journal of Electrical Engineering |
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| Online Access: | https://eej.aut.ac.ir/article_4905_40fdf848424256dcc7e1f2eb709c9d89.pdf |
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| author | Mohammad Yavari |
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| description | In this paper, a tutorial review on several structural improvements of the CMOS folded-cascode Operational Transconductance Amplifier (OTA) is presented. After a brief discussion on the structure and operation of the conventional Folded-Cascode Amplifier, its several architectural improvements are reviewed. These improvements include advances on class A and class AB Folded-Cascode Amplifier s and recycling Folded-Cascode Amplifier. Afterwards, several improved class A and class AB recycling folded-cascode Operational Transconductance Amplifiers are discussed, and finally some two-stage Operational Transconductance Amplifiers based on the current recycling technique are reviewed. As it can be seen, many architectural innovations have been proposed to improve both small-signal parameters, including DC gain, unity-gain bandwidth, phase margin, and large-signal operation, which is usually characterized by slew rate in the proposed OTAs compared to the basic Folded-Cascode Amplifier. Current recycling, shunt current sources, cross-coupled transistors to realize local positive feedback paths, local Common-Mode Feedback, Flipped Voltage Follower cells to realize class AB operation, active current mirrors, and several other techniques have been utilized in the structural improvements of the basic folded-cascode Operational Transconductance Amplifier. The achieved results are more promising and demonstrate substantial achievements in the design of Operational Transconductance Amplifiers in low-voltage and more scaled nano-meter CMOS processes. |
| format | Article |
| id | doaj-art-6aeb26d471c54fdea3ab2467e8bf63ac |
| institution | OA Journals |
| issn | 2588-2910 2588-2929 |
| language | English |
| publishDate | 2022-12-01 |
| publisher | Amirkabir University of Technology |
| record_format | Article |
| series | AUT Journal of Electrical Engineering |
| spelling | doaj-art-6aeb26d471c54fdea3ab2467e8bf63ac2025-08-20T02:34:56ZengAmirkabir University of TechnologyAUT Journal of Electrical Engineering2588-29102588-29292022-12-0154Issue 2 (Special Issue)31533210.22060/eej.2022.21597.54854905Advances on CMOS Folded-Cascode Operational TransconductanceMohammad Yavari0Integrated Circuits Design Laboratory, Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, IranIn this paper, a tutorial review on several structural improvements of the CMOS folded-cascode Operational Transconductance Amplifier (OTA) is presented. After a brief discussion on the structure and operation of the conventional Folded-Cascode Amplifier, its several architectural improvements are reviewed. These improvements include advances on class A and class AB Folded-Cascode Amplifier s and recycling Folded-Cascode Amplifier. Afterwards, several improved class A and class AB recycling folded-cascode Operational Transconductance Amplifiers are discussed, and finally some two-stage Operational Transconductance Amplifiers based on the current recycling technique are reviewed. As it can be seen, many architectural innovations have been proposed to improve both small-signal parameters, including DC gain, unity-gain bandwidth, phase margin, and large-signal operation, which is usually characterized by slew rate in the proposed OTAs compared to the basic Folded-Cascode Amplifier. Current recycling, shunt current sources, cross-coupled transistors to realize local positive feedback paths, local Common-Mode Feedback, Flipped Voltage Follower cells to realize class AB operation, active current mirrors, and several other techniques have been utilized in the structural improvements of the basic folded-cascode Operational Transconductance Amplifier. The achieved results are more promising and demonstrate substantial achievements in the design of Operational Transconductance Amplifiers in low-voltage and more scaled nano-meter CMOS processes.https://eej.aut.ac.ir/article_4905_40fdf848424256dcc7e1f2eb709c9d89.pdfcmos operational transconductance amplifiers (otas)folded-cascode otaactive current mirrorsrecycling folded-cascode otaflipped voltage follower cellsclass abcross-coupled positive feedbacklocal common-mode feedbackswitched-capacitor circuitsfast settling |
| spellingShingle | Mohammad Yavari Advances on CMOS Folded-Cascode Operational Transconductance AUT Journal of Electrical Engineering cmos operational transconductance amplifiers (otas) folded-cascode ota active current mirrors recycling folded-cascode ota flipped voltage follower cells class ab cross-coupled positive feedback local common-mode feedback switched-capacitor circuits fast settling |
| title | Advances on CMOS Folded-Cascode Operational Transconductance |
| title_full | Advances on CMOS Folded-Cascode Operational Transconductance |
| title_fullStr | Advances on CMOS Folded-Cascode Operational Transconductance |
| title_full_unstemmed | Advances on CMOS Folded-Cascode Operational Transconductance |
| title_short | Advances on CMOS Folded-Cascode Operational Transconductance |
| title_sort | advances on cmos folded cascode operational transconductance |
| topic | cmos operational transconductance amplifiers (otas) folded-cascode ota active current mirrors recycling folded-cascode ota flipped voltage follower cells class ab cross-coupled positive feedback local common-mode feedback switched-capacitor circuits fast settling |
| url | https://eej.aut.ac.ir/article_4905_40fdf848424256dcc7e1f2eb709c9d89.pdf |
| work_keys_str_mv | AT mohammadyavari advancesoncmosfoldedcascodeoperationaltransconductance |