Please use this identifier to cite or link to this item: 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: http://dx.doi.org/10.1109/TCSI.2008.2001831
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Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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