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A 0.0045-mm2 32.4-μW Two-Stage Amplifier for pF-to-nF Load Using CM Frequency Compensation
Zushu Yan1; Wei Wang1; Pui-In Mak1; Man-Kay Law1; Rui P. Martins1,2
2015-03-01
Source PublicationIEEE Transactions on Circuits and Systems II: Express Briefs
ISSN1549-7747
Volume62Issue:3Pages:246-250
Abstract

This brief reports an embedded capacitor multiplier (CM) frequency compensation technique to realize an extremely compact micropower two-stage amplifier for wide capacitive load (C) drivability. It features: 1) a valuable left half-plane zero to enhance the closed-loop stability over a wide range of C; 2) no extra bias circuit and power, as the CM is embedded into the first stage of the amplifier, and 3) only one very small (subpicofarad) compensation capacitor improving the transient settling and area efficiency. Detailed analytical treatments of the amplifier offer the critical insights for device sizing and optimization. Fabricated in 0.18-μm CMOS, the amplifier measures 3.06-MHz unity-gain frequency (UGF), 1.76-V/μs average slew rate (SR), and 74° phase margin (PM) at 20-pF C, and 0.22-MHz UGF, 0.049-V/μs SR, and 59.8° PM at 15-nF C. The die size is 0.0045 mm, and power is 32.4 μW at 1.2 V. Competitive large- and small-signal figures of merit are achieved with respect to the state of the art.

KeywordCapacitive Load Capacitor Multiplier Cmos Frequency Compensation Stability Two-stage Amplifier
DOIhttp://doi.org/10.1109/TCSII.2014.2368972
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000350884900007
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Cited Times [WOS]:15   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
INSTITUTE OF MICROELECTRONICS
Corresponding AuthorPui-In Mak; Rui P. Martins
Affiliation1.State Key Laboratory of Analog and Mixed-Signal VLSI and the Faculty of Science and Technology, Department of Electrical and Computer Engineering (ECE), University of Macau, Macau, China
2.Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
First Author AffilicationFaculty of Science and Technology
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Zushu Yan,Wei Wang,Pui-In Mak,et al. A 0.0045-mm2 32.4-μW Two-Stage Amplifier for pF-to-nF Load Using CM Frequency Compensation[J]. IEEE Transactions on Circuits and Systems II: Express Briefs,2015,62(3):246-250.
APA Zushu Yan,Wei Wang,Pui-In Mak,Man-Kay Law,&Rui P. Martins.(2015).A 0.0045-mm2 32.4-μW Two-Stage Amplifier for pF-to-nF Load Using CM Frequency Compensation.IEEE Transactions on Circuits and Systems II: Express Briefs,62(3),246-250.
MLA Zushu Yan,et al."A 0.0045-mm2 32.4-μW Two-Stage Amplifier for pF-to-nF Load Using CM Frequency Compensation".IEEE Transactions on Circuits and Systems II: Express Briefs 62.3(2015):246-250.
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