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https://hdl.handle.net/10356/92040| Title: | A low voltage micropower digital Class D amplifier modulator for hearing aids | Authors: | Adrian, Victor Chang, Joseph Sylvester Gwee, Bah Hwee |
Keywords: | DRNTU::Engineering::Electrical and electronic engineering | Issue Date: | 2009 | Source: | 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. | Series/Report no.: | IEEE transactions on circuits and systems—II | Abstract: | 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. | URI: | https://hdl.handle.net/10356/92040 http://hdl.handle.net/10220/6249 |
ISSN: | 1549-8328 | DOI: | 10.1109/TCSI.2008.2001831 | Schools: | School of Electrical and Electronic Engineering | Rights: | © 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. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
| Appears in Collections: | EEE Journal Articles |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| A Low Voltage Micropower Digital Class D Amplifier Modulator for Hearing Aids.pdf | 1.31 MB | Adobe PDF |  View/Open |
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