A low-power silicon-on-insulator PWM discriminator for biomedical applications
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Data
2000-01-01
Autores
Lima, Jader A. de [UNESP]
Silva, Sidnei F. [UNESP]
Cordeiro, Adriano S. [UNESP]
Araujo, Alexandro C. [UNESP]
Verleysen, Michel [UNESP]
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Editor
Institute of Electrical and Electronics Engineers (IEEE)
Resumo
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. Nonoverlapping 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 mu m single-metal SOI fabrication process and has an effective area of 2mm(2) Typically, the measured resolution of encoding parameter a was better than 10% at 6MHz and V-DD=3.3V. Stand-by consumption is around 340 mu W. Pulses with frequencies up to 15MHz and alpha = 10% can be discriminated for V-DD spanning from 2.3V to 3.3V. Such an excellent immunity to V-DD deviations meets a design specification with respect to inherent coupling losses on transmitting data and power by means of a transcutaneous link.
Descrição
Palavras-chave
Digital filters, Electric network analysis, Electric network synthesis, Energy utilization, Image analysis, Image quality, Integrated circuit layout, Phase comparators, Pulse width modulation, Signal encoding, Silicon on insulator technology, Body-implanted neurostimulators, Fast-settling comparators, CMOS integrated circuits
Como citar
Iscas 2000: IEEE International Symposium on Circuits and Systems - Proceedings, Vol V. New York: IEEE, p. 277-280, 2000.