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A low-power silicon-on-insulator PWM discriminator for biomedical applications

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5 Author(s)
De Lima, J.A. ; Dept. of Electr. Eng., Univ. Estadual Paulista, Sao Paulo, Brazil ; Silva, S.F. ; Cordeiro, A.S. ; Araujo, A.C.
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A CMOS/SOI circuit to decode PWM signals is presented as part of a body-implanted neurostimulator for visual prosthesis. Since encoded data is the sole input to the circuit, the decoding technique is based on a double-integration concept and does not require DC filtering. Non-overlapping control phases are internally derived from the incoming pulses and a fast-settling comparator ensures good discrimination accuracy in the megahertz range. The circuit was integrated on a 2 μm single-metal SOI fabrication process and has an effective area of 2mm 2. Typically, the measured resolution of the encoding parameter α was better than 10% at 6 MHz and VDD=3.3 V. Stand-by consumption is around 340 μW. Pulses with frequencies up to 15 MHz and α=10% can be discriminated for VDD spanning from 2.3 V to 3.3 V. Such an excellent immunity to VDD deviations meets a design specification with respect to inherent coupling losses on transmitting data and power by means of a transcutaneous link

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Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on  (Volume:5 )

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