EE_270_telemetry_slides_April_2_lecture

EE_270_telemetry_slides_April_2_lecture - Telemetry for...

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Unformatted text preview: Telemetry for Neural Implants-- EE270 @ UCSC-- BME552 @ USC Prof. Wentai Liu wentai@soe.ucsc.edu Role of Electronics in Neural Implants b Main component of neural prosthetic devices implementing the function of recording or stimulating Outline b Introduction b Basics b Inductor, Capacitor, Resistor b Coil basics b Power amplifier basics b Power and Data Telemetry b Power telemetry components b Data telemetry components b Example for stimulating: retinal prosthesis b Example for recording: Neural recording Telemetry b Telemetry Definition The science and technology of automatic measurement and transmission of data by wire, radio, or other means from remote sources, as from space vehicles, to receiving stations for recording and analysis. b Biotelemetry Definition Remote detection and measurement of a human or animal condition, activity, or function (as heartbeat or body temperature) Electrical Elements b Resistors are energy consuming elements b Capacitors store energy within an electric field b Inductors (coils) also store energy, within a magnetic field b Energy can be transferred through the fields b Inductors (coils) are used to transmit energy/data in biomedical implants applications Electric Field and Magnetic Field b Capacitive coupling b Good for short range (smart card) b Antennas used to transmit RF waves (have both electric and magnetic fields) b Example - AM radio b Good for long distances b Coils transmitted/receive magnetic field b Example transformer b Good for close distance, power, coupling efficiency b Magnetic fields used for transmission of data and power to biomedical implants Electric Field and Magnetic Field H-field for Inductively Coupled Systems b Magnetic coil b Used in near field RFID systems b Near field limit b 353m at 135kHz b 7.1m at 6.78MHz b 3.5m at 13.56Mhz b 1.7m at 27.125Mhz Field Strength H vs. distance at a frequency of 13.56Mhz Coil Basics (1) Coil: A metallic or conductive wire is looped around a core to create an electronic inductor. Coil is used to generate magnetic field (transmitter) or convert magnetic field. ideally Parasitic components: resistance and capacitance L more accurate model Coil Basics (2) b Inductance: n: number of turns; L unit : unit inductance, inductance of one turn (but which occupies the same space as multiple-turn coils. a function of coil geometry ( shape, diameter, cross-section area, etc.) b Resistance DC resistance AC resistance, function of frequency <-- skin effect, proximity effect b Capacitance A L R DC = d A C = unit L n L 2 = Coil Basics (3) b Self-resonating frequency A frequency at which the equivalent coil impedance is maximum. Coil is often used well below its self-resonating frequency....
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This note was uploaded on 06/08/2009 for the course BME 552 taught by Professor Berger,weiland during the Spring '09 term at USC.

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EE_270_telemetry_slides_April_2_lecture - Telemetry for...

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