{"title":"A local positive feedback loop-reused technique for enhancing performance of folded cascode amplifier","authors":"Xiaosong Wang, Xiao Zhao, Yu Zhang, Chen Wang, Liyuan Dong","doi":"10.1016/j.vlsi.2024.102277","DOIUrl":null,"url":null,"abstract":"<div><p>A current-reused folded cascode operational transconductance amplifier (OTA) using a local positive feedback (LPFB) technique has been proposed in previous literature, which does not achieve maximum unity gain-bandwidth (GBW). Besides, the stability of LPFB in the LPFB-OTA is limited by local common mode feedback (LCMFB) resistors. Based on the analysis, a local positive feedback loop-reused (LPFBR) technique is proposed to improve the performance of conventional LPFB OTA. For a fair comparison, both conventional and proposed OTAs working at saturation region are designed and simulated in SMIC <span><math><mrow><mn>0</mn><mo>.</mo><mn>18</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> process. The simulated results demonstrate that the proposed LPFBR-OTA has almost 10.5 times the bandwidth and maintains stability compared to that of the conventional LPFB-OTA under the condition that LCMFB resistors are increased by a factor of 10.</p></div>","PeriodicalId":54973,"journal":{"name":"Integration-The Vlsi Journal","volume":"100 ","pages":"Article 102277"},"PeriodicalIF":2.2000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Integration-The Vlsi Journal","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S016792602400141X","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"COMPUTER SCIENCE, HARDWARE & ARCHITECTURE","Score":null,"Total":0}
引用次数: 0
Abstract
A current-reused folded cascode operational transconductance amplifier (OTA) using a local positive feedback (LPFB) technique has been proposed in previous literature, which does not achieve maximum unity gain-bandwidth (GBW). Besides, the stability of LPFB in the LPFB-OTA is limited by local common mode feedback (LCMFB) resistors. Based on the analysis, a local positive feedback loop-reused (LPFBR) technique is proposed to improve the performance of conventional LPFB OTA. For a fair comparison, both conventional and proposed OTAs working at saturation region are designed and simulated in SMIC process. The simulated results demonstrate that the proposed LPFBR-OTA has almost 10.5 times the bandwidth and maintains stability compared to that of the conventional LPFB-OTA under the condition that LCMFB resistors are increased by a factor of 10.
期刊介绍：
Integration''s aim is to cover every aspect of the VLSI area, with an emphasis on cross-fertilization between various fields of science, and the design, verification, test and applications of integrated circuits and systems, as well as closely related topics in process and device technologies. Individual issues will feature peer-reviewed tutorials and articles as well as reviews of recent publications. The intended coverage of the journal can be assessed by examining the following (non-exclusive) list of topics:
Specification methods and languages; Analog/Digital Integrated Circuits and Systems; VLSI architectures; Algorithms, methods and tools for modeling, simulation, synthesis and verification of integrated circuits and systems of any complexity; Embedded systems; High-level synthesis for VLSI systems; Logic synthesis and finite automata; Testing, design-for-test and test generation algorithms; Physical design; Formal verification; Algorithms implemented in VLSI systems; Systems engineering; Heterogeneous systems.
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