An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications
This paper presents a novel class H power amplifier aiming for audio applications on battery-powered electronic devices. The power supply of the amplifier is adaptively adjusted to track the instantaneous input signal amplitude for higher power efficiency. By embedding audio input signal amplitude i...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/152136 |
| _version_ | 1811676503004413952 |
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| author | Zhang, Xiang Siek, Liter |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Zhang, Xiang Siek, Liter |
| author_sort | Zhang, Xiang |
| collection | NTU |
| description | This paper presents a novel class H power amplifier aiming for audio applications on battery-powered electronic devices. The power supply of the amplifier is adaptively adjusted to track the instantaneous input signal amplitude for higher power efficiency. By embedding audio input signal amplitude information into the class AB amplifier's output common-mode voltage level, the amplifier is able to operate with only single-rail power supply and demonstrates more smooth transitions between the light load and heavy load mode, hence achieves lower total harmonic distortion (THD) for a wide load range. Fabricated in the AMS 0.18-μm CMOS process, the chip consumes 3.52 mW quiescent power and is able to deliver 526 mW peak output power to a 16 Ω load. The measurement results indicate that the amplifier incurs no deterioration on THD when entering the supplytracking mode and achieves a lowest THD+N ratio of -80 dB. The peak power efficiency of the system is 80.4%; moreover, it demonstrates significant higher efficiency for medium load range compared to other linear mode amplifiers. |
| first_indexed | 2024-10-01T02:22:30Z |
| format | Journal Article |
| id | ntu-10356/152136 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:22:30Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1521362021-07-23T02:07:21Z An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications Zhang, Xiang Siek, Liter School of Electrical and Electronic Engineering EDB Broadcom VIRTUS, IC Design Centre of Excellence Engineering::Electrical and electronic engineering Audio Power Amplifier Class H Amplifier This paper presents a novel class H power amplifier aiming for audio applications on battery-powered electronic devices. The power supply of the amplifier is adaptively adjusted to track the instantaneous input signal amplitude for higher power efficiency. By embedding audio input signal amplitude information into the class AB amplifier's output common-mode voltage level, the amplifier is able to operate with only single-rail power supply and demonstrates more smooth transitions between the light load and heavy load mode, hence achieves lower total harmonic distortion (THD) for a wide load range. Fabricated in the AMS 0.18-μm CMOS process, the chip consumes 3.52 mW quiescent power and is able to deliver 526 mW peak output power to a 16 Ω load. The measurement results indicate that the amplifier incurs no deterioration on THD when entering the supplytracking mode and achieves a lowest THD+N ratio of -80 dB. The peak power efficiency of the system is 80.4%; moreover, it demonstrates significant higher efficiency for medium load range compared to other linear mode amplifiers. Economic Development Board (EDB) The authors would like to thank EDB and Broadcom Singapore Pte Ltd. for providing the scholarship. 2021-07-23T02:07:20Z 2021-07-23T02:07:20Z 2017 Journal Article Zhang, X. & Siek, L. (2017). An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications. IEEE Transactions On Very Large Scale Integration (VLSI) Systems, 25(6), 1954-1965. https://dx.doi.org/10.1109/TVLSI.2017.2666268 1063-8210 https://hdl.handle.net/10356/152136 10.1109/TVLSI.2017.2666268 6 25 1954 1965 en IEEE Transactions on Very Large Scale Integration (VLSI) Systems © 2017 Institute of Electrical and Electronics Engineers (IEEE). All rights reserved. |
| spellingShingle | Engineering::Electrical and electronic engineering Audio Power Amplifier Class H Amplifier Zhang, Xiang Siek, Liter An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications |
| title | An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications |
| title_full | An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications |
| title_fullStr | An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications |
| title_full_unstemmed | An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications |
| title_short | An 80.4% peak power efficiency adaptive supply class H power amplifier for audio applications |
| title_sort | 80 4 peak power efficiency adaptive supply class h power amplifier for audio applications |
| topic | Engineering::Electrical and electronic engineering Audio Power Amplifier Class H Amplifier |
| url | https://hdl.handle.net/10356/152136 |
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