Journal
IEEE ACCESS
Volume 8, Issue -, Pages 226167-226175Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2020.3044608
Keywords
Operational transconductance amplifier; slew-rate; class-AB; delta-sigma modulator; feedforward architecture; switched-capacitor
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Funding
- Ministry of Science and ICT (MSIT), South Korea, under the Information Technology Research Center (ITRC) [IITP-2020-2018-0-01421]
- Ministry of Trade, Industry and Energy (MOTIE) [10080488]
- Korea Semiconductor Research Consortium (KSRC) support program
- National Research Foundation of Korea (NRF) - Korean Government (MSIT) [202000000001166]
- National Research Foundation of Korea [5199991314124] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This article presents a class-AB operational transconductance amplifier (OTA) with a high slew rate. The proposed class-AB OTA is applied with a slew-rate enhancement technique using an extremely low quiescent current. The additional current-reference common-mode feedback loop resolves the susceptibility to process, voltage, and temperature fluctuations resulting from slew-rate enhancement transistors. The proposed class-AB OTA is most widely used in block design, including, a switched-capacitor circuit, analog-to-digital converter, digital-to-analog converter, low-dropout regulator, and switched-capacitor DC-DC converters. In this study, performance was validated by applying the proposed class-AB OTA to a switched-capacitor delta-sigma modulator which requires high performance and high precision. The circuit was designed and simulated using a 0.18- mu m complementary metal-oxide semiconductor process.
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