FABRICATION OF CMOS IC FOR TELEMETERING BIOLOGICAL SIGNALS FROM MULTIPLE SUBJECTS

This paper presents the fabrication of an implantable CMOS IC for deve loping a multiple subject biotelemetry system and proposes the princip al operation of the multiple subjects telemetry. This system can trans mit maximum 7-channel biological signals simultaneously from 8 subject s. Implantable circuits of this system are fabricated on a single chip with a size of 4 x 4 mm. This IC is designed not only to achieve smal l size and low power dissipation, but also to enable continuous measur ement of biological signals from the selected subject. The main featur es of this system are to select one of the 8 subjects and to enable co ntinuous measurement of the biological signals and transmit them back to the external receiver system. Low power consumption is accomplished by ON-OFF switching of an implanted battery by receiving command sign als from the external circuit.