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Multi-Channel Analog Front-End for Auditory Nerve Signal Detection  

Cheon, Ji-Min (Department of Electrical and Electronic Eng., Yonsei University)
Lim, Seung-Hyun (Department of Electrical and Electronic Eng., Yonsei University)
Lee, Dong-Myung (Department of Electrical and Electronic Eng., Yonsei University)
Chang, Eun-Soo (Department of Electrical and Electronic Eng., Yonsei University)
Han, Gun-Hee (Department of Electrical and Electronic Eng., Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.47, no.1, 2010 , pp. 60-68 More about this Journal
Abstract
In case of sensorineural hearing loss, auditory perception can be activated by electrical stimulation of the nervous system via electrode implanted into the cochlea or auditory nerve. Since the tonotopic map of the human auditory nerve has not been definitively identified, the recording of auditory nerve signal with microelectrode is desirable for determining the tonotopic map. This paper proposes the multi-channel analog front-end for auditory nerve signal detection. A channel of the proposed analog front-end consists of an AC coupling circuit, a low-power 4th-order Gm-C LPF, and a single-slope ADC. The AC coupling circuit transfers only AC signal while it blocks DC signal level. Considering the bandwidth of the auditory signal, the Gm-C LPF is designed with OTAs adopting floating-gate technique. For the channel-parallel ADC structure, the single-slope ADC is used because it occupies the small silicon area. Experimental results shows that the AC coupling circuit and LPF have the bandwidth of 100 Hz - 6.95 kHz and the ADC has the effective resolution of 7.7 bits. The power consumption per a channel is $12\;{\mu}W$, the power supply is 3.0 V, and the core area is $2.6\;mm\;{\times}\;3.7\;mm$. The proposed analog front-end was fabricated in a 1-poly 4-metal $0.35-{\mu}m$ CMOS process.
Keywords
Analog front-end; auditory nerve; electrode; floating-gate; Gm-C filter;
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