tailieunhanh - Biomedical Engineering Trends in Electronics Communications and Software Part 2

Tham khảo tài liệu 'biomedical engineering trends in electronics communications and software part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 30 Biomedical Engineering Trends in Electronics Communications and Software V int ext rL 1 P RLXCeq R2 1 p 2 X2 r2 1 p 2 X2 rL 1 p XCeq RL 1 p XCeq 11 where Xceq is the reactance of Ceq CBodyi CBody2 and P Cn C. Assuming Cin Ceq equation 11 becomes V X V_ int ext rL RLXCeq 2 X2 tjr2 x2 L XCeq RL XCeq J 12 and the voltage transfer rate is given by Vint rL Vext RL XCeq 13 Thus Vint is maximized when XCeq RL. Fig. 7. Energy confinement in the capacitive coupling approach. Fig. 8. Simplified schematic of a capacitive link. Wireless Telemetry for Implantable Biomedical Microsystems 31 Unit capacitances and reactance of 1 mm X 1 mm parallel plates 1 mm apart from each other are calculated and plotted in Figs. 9 and 10 for frequencies between 100 kHz and 10 MHz. Calculations are based on the dielectric properties of biological tissues at RF and microwave frequencies reported in Gabriel et al. 1996a b c which are also available as an internet resource by the Italian National Research Council Institute for Applied Physics IFAC . Fig. 9 shows that in general unit capacitances of the skin and muscle increase with the frequency. However as illustrated in Fig. 10 unit reactance of dry skin decreases as the frequency increases while unit reactances of wet skin and muscle are almost constant and only change about 20 over the frequency range 1 MHz - 10 MHz. a Fig. 10. Unit reactance of 1 mm X 1 mm plates 1 mm apart from each other for frequencies between a 100 kHz and 1 MHz and b 1 MHz and 10 MHz a b Fig. 9. Unit capacitance of 1 mm X 1 mm plates 1 mm apart from each other for frequencies between a 100 kHz and 1 MHz and b 1 MHz and 10 MHz b

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