Abstract
This paper presents a wideband frequency-shift keying (FSK) demodulator suitable for a digital data transmission chain of wireless neural stimulation microsystems such as cochlear implants and retinal prostheses. The demodulator circuit derives a constant frequency clock directly from an FSK carrier, and uses this clock to sample the data bits. The circuit occupies 0.03 mm2 using a 0.6 μm, 2M/2P, standard CMOS process, and consumes 0.25 mW at 5 V. This circuit was experimentally tested at transmission speed of up to 2.5 Mbps while receiving a 5∼10 MHz FSK carrier signal in a cochlear implant system.
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Project supported by the National Basic Research Program (973) of China (No. G2000036508) and the National Natural Science Foundation of China (No. 60475018)
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Dong, M., Zhang, C., Mai, Sp. et al. A wideband frequency-shift keying demodulator for wireless neural stimulation microsystems. J. Zhejiang Univ. - Sci. A 7, 1056–1060 (2006). https://doi.org/10.1631/jzus.2006.A1056
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DOI: https://doi.org/10.1631/jzus.2006.A1056