Fig. 1.
The conventional hearing aid system.
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Fanyang Li, Hao Jiang. A hearing aid on-chip system based on accuracy optimized front-and back-end blocks[J]. Journal of Semiconductors, 2014, 35(3): 035006. doi: 10.1088/1674-4926/35/3/035006
F Y Li, H Jiang. A hearing aid on-chip system based on accuracy optimized front-and back-end blocks[J]. J. Semicond., 2014, 35(3): 035006. doi: 10.1088/1674-4926/35/3/035006.
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A hearing aid on-chip system based on accuracy optimized front-and back-end blocks
doi: 10.1088/1674-4926/35/3/035006
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Abstract
A hearing aid on-chip system based on accuracy optimized front-and back-end blocks is presented for enhancing the signal processing accuracy of the hearing aid. Compared with the conventional system, the accuracy optimized system is characterized by the dual feedback network and the gain compensation technique used in the front-and back-end blocks, respectively, so as to alleviate the nonlinearity distortion caused by the output swing. By using the technique, the accuracy of the whole hearing aid system can be significantly improved. The prototype chip has been designed with a 0.13 μm standard CMOS process and tested with 1 V supply voltage. The measurement results show that, for driving a 16 Ω loudspeaker with a normalized output level of 300 mVp-p, the total harmonic distortion reached about -60 dB, achieving at least three times reduction compared to the previously reported works. In addition, the typical input referred noise is only about 5 μ Vrms.-
Keywords:
- front-end,
- back-end,
- pre-amplifier,
- driving amplifier,
- hearing aid
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References
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