NDLI: Low power complementary metal-oxide semiconductor class-G audio amplifier with gradual power supply switching

Content Provider	IET Digital Library
Author	Bhamidipati, Bharadvaj Menchi, Adrian I. Colli Sinencio, Edgar Sánchez
Abstract	The architecture, design and implementation of a low power complementary metal-oxide semiconductor (CMOS) class-G audio amplifier with gradual power-supply switching (GPSS) are presented. The proposed class-G amplifier output stage strategically uses the parallel connection of a class-AB output stage operating from smaller supplies (V DDL/V SSL), and a class-C output stage (with crossover from V SSL to V DDL) operating from higher supplies (V DDH/V SSH). GPSS is achieved using an efficient biasing scheme with level shifters. Moreover, the proposed biasing scheme in conjunction with negative feedback enables low distortion during the power-supply transition. Experimentally, the class-G amplifier prototype achieves a −82.5 dB THD + N, a peak load power of 50 mW and a quiescent power consumption of 350 μW. The proposed class-G amplifier was implemented in a standard CMOS 90 nm technology and occupies an active silicon area of 0.08 mm2.
Starting Page	256
Ending Page	264
Page Count	9
ISSN	1751858X
Volume Number	9
e-ISSN	17518598
Issue Number	Issue 4, Jul (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cds/9/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cds.2014.0263
Journal	IET Circuits, Devices & Systems
Publisher Date	2015-06-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Amplifiers Audio-frequency Amplifiers Biasing Scheme Class-AB Output Stage Class-C Output Stage CMOS Analogue Integrated Circuit CMOS Integrated Circuit Complementary Metal-oxide Semiconductor Feedback Amplifiers GPSS Gradual Power Supply Switching Level Shifters Low Power Class-G Audio Amplifier Low Power Electronics Negative Feedback Parallel Connection Power 350 MuW Power 50 MW Power Electronics Power Supply Power Supply Circuit Power-supply Transition Size 90 Nm Standard CMOS Technology Supervisory Circuit
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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