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0.0045-mm2 15.8-µW three-stage amplifier driving 10X-wide (0.15–1.5 nF) capacitive loads with >50° phase margin
Yan, Z.; Mak, P. I.; Law, M. K.; Martins, R. P.
2015-03-01
Source PublicationElectronics Letters
ISSN0013-5194
Pages454-456
Abstract

A three-stage amplifier employing embedded capacitor-multiplier compensation (ECMC) and active parallel compensation (APC) to enhance the area efficiency when driving nF-range capacitive loads (C L) is presented. Unlike the conventional current-buffer Miller compensation, ECMC applied to the dominant compensation path saves substantial power and area, while securing a large gain–bandwidth product. The created left-half-plane zero also benefits the phase margin (PM). For the APC, unlike the traditional passive parallel compensation, this work benefits from the Miller effect to avoid the area-consuming resistor, and reduces the entailed capacitances without lowering the parasitic pole position. A multi-path Gm-boosting second stage enhances the effective transconductance and DC gain. With 0.0045 mm2 of area and 15.8 µW of power, the 0.18 µm CMOS three-stage amplifier measures 1.13 MHz unity-gain frequency, 0.41 V/µs average slew rate and 56.2° PM at 1 nF CL. Stable responses with >50° PM are attained for a 10X range of CL from 0.15 to 1.5 nF. The achieved figure-of-merit accounting for both die area and power compares favourably with the state of the art.

KeywordThree-stage Amplifier Wide Capacitive Load Embedded Capacitor-multiplier Compensation Active Parallel Compensation
DOI10.1049/el.2014.4391
URLView the original
Language英語English
WOS IDWOS:000351271700012
The Source to ArticlePB_Publication
Scopus ID2-s2.0-84924743611
Fulltext Access
Citation statistics
Document TypeJournal article
CollectionINSTITUTE OF MICROELECTRONICS
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Corresponding AuthorMak, P. I.
Recommended Citation
GB/T 7714
Yan, Z.,Mak, P. I.,Law, M. K.,et al. 0.0045-mm2 15.8-µW three-stage amplifier driving 10X-wide (0.15–1.5 nF) capacitive loads with >50° phase margin[J]. Electronics Letters, 2015, 454-456.
APA Yan, Z.., Mak, P. I.., Law, M. K.., & Martins, R. P. (2015). 0.0045-mm2 15.8-µW three-stage amplifier driving 10X-wide (0.15–1.5 nF) capacitive loads with >50° phase margin. Electronics Letters, 454-456.
MLA Yan, Z.,et al."0.0045-mm2 15.8-µW three-stage amplifier driving 10X-wide (0.15–1.5 nF) capacitive loads with >50° phase margin".Electronics Letters (2015):454-456.
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