A low voltage micropower digital Class D amplifier modulator for hearing aids
We present a micropower digital modulator for class-D amplifiers for power-critical digital hearing aids. The modulator design embodies a proposed Lagrange interpolation (a combined first- and second-order Lagrange) algorithmic pulsewidth modulation (PWM) and a third-order DeltaSigma noise shaper. B...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2010
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| Online Access: | https://hdl.handle.net/10356/92040 http://hdl.handle.net/10220/6249 |
| _version_ | 1811687219553894400 |
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| author | Adrian, Victor Chang, Joseph Sylvester Gwee, Bah Hwee |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Adrian, Victor Chang, Joseph Sylvester Gwee, Bah Hwee |
| author_sort | Adrian, Victor |
| collection | NTU |
| description | We present a micropower digital modulator for class-D amplifiers for power-critical digital hearing aids. The modulator design embodies a proposed Lagrange interpolation (a combined first- and second-order Lagrange) algorithmic pulsewidth modulation (PWM) and a third-order DeltaSigma noise shaper. By means of double-Fourier-series analysis, we analyze and determine the harmonic nonlinearities of the proposed algorithmic PWM. At 48-kHz sampling, 96-kHz PWM output, 997-Hz input, and input modulation index=0.9, the modulator circuit achieves a total harmonic distortion + noise (THD + N) of - 74dB (0.02%) over an 8-kHz voice bandwidth-12-dB THD + N improvement over a reported design and yet dissipates only ~ 50% of the power. The proposed modulator dissipates the lowest power dissipation of all modulators compared, and by means of a proposed figure of merit, the proposed modulator exhibits very competitive performance. The modulator IC is fabricated in a 0.35-mum digital CMOS process with a core area of 0.46 mm2. |
| first_indexed | 2024-10-01T05:12:50Z |
| format | Journal Article |
| id | ntu-10356/92040 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:12:50Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | ntu-10356/920402020-03-07T14:02:41Z A low voltage micropower digital Class D amplifier modulator for hearing aids Adrian, Victor Chang, Joseph Sylvester Gwee, Bah Hwee School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering We present a micropower digital modulator for class-D amplifiers for power-critical digital hearing aids. The modulator design embodies a proposed Lagrange interpolation (a combined first- and second-order Lagrange) algorithmic pulsewidth modulation (PWM) and a third-order DeltaSigma noise shaper. By means of double-Fourier-series analysis, we analyze and determine the harmonic nonlinearities of the proposed algorithmic PWM. At 48-kHz sampling, 96-kHz PWM output, 997-Hz input, and input modulation index=0.9, the modulator circuit achieves a total harmonic distortion + noise (THD + N) of - 74dB (0.02%) over an 8-kHz voice bandwidth-12-dB THD + N improvement over a reported design and yet dissipates only ~ 50% of the power. The proposed modulator dissipates the lowest power dissipation of all modulators compared, and by means of a proposed figure of merit, the proposed modulator exhibits very competitive performance. The modulator IC is fabricated in a 0.35-mum digital CMOS process with a core area of 0.46 mm2. Published version 2010-05-04T08:13:19Z 2019-12-06T18:16:17Z 2010-05-04T08:13:19Z 2019-12-06T18:16:17Z 2009 2009 Journal Article Adrian, V., Chang, J. S., & Gwee, B. H. (2009). A low voltage micropower digital Class D amplifier modulator for hearing aids. IEEE Transactions on Circuits And Systems—II. 56(2), 337-349. 1549-8328 https://hdl.handle.net/10356/92040 http://hdl.handle.net/10220/6249 10.1109/TCSI.2008.2001831 en IEEE transactions on circuits and systems—II © 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. http://www.ieee.org/portal/site This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. 13 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering Adrian, Victor Chang, Joseph Sylvester Gwee, Bah Hwee A low voltage micropower digital Class D amplifier modulator for hearing aids |
| title | A low voltage micropower digital Class D amplifier modulator for hearing aids |
| title_full | A low voltage micropower digital Class D amplifier modulator for hearing aids |
| title_fullStr | A low voltage micropower digital Class D amplifier modulator for hearing aids |
| title_full_unstemmed | A low voltage micropower digital Class D amplifier modulator for hearing aids |
| title_short | A low voltage micropower digital Class D amplifier modulator for hearing aids |
| title_sort | low voltage micropower digital class d amplifier modulator for hearing aids |
| topic | DRNTU::Engineering::Electrical and electronic engineering |
| url | https://hdl.handle.net/10356/92040 http://hdl.handle.net/10220/6249 |
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