A low-power silicon-on-insulator PWM discriminator for biomedical applications
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Undergraduate course
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Institute of Electrical and Electronics Engineers (IEEE)
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Work presented at event
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Acesso aberto
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Abstract
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.
Description
Keywords
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
Language
English
Citation
Iscas 2000: IEEE International Symposium on Circuits and Systems - Proceedings, Vol V. New York: IEEE, p. 277-280, 2000.
