Abstract
In recent years, the development of implantable electronics has been driven by the motivation to expand their field of application. The main intention is to implement advanced functionalities while increasing the degree of miniaturization and maintaining reliability. The intrinsic nonlinear properties of the electronic components, to be used anyway, could be utilized to resolve this issue. To master the implementation of functionalities in implantable electronics using the nonlinear properties of its electronic components, simulation models are of utmost importance. In this paper, we present a simulation model that is optimized in terms of consistency, computing time and memory consumption. Three circuit topologies of nonlinear capacitors, including hysteresis losses, are investigated. An inductively coupled measurement setup was realized to validate the calculations. The best results were obtained using the Trapezoid method in ANSYS with a constant step size and a resolution of 500 k points and using the Adams method in Mathcad with a resolution of 50 k points. An inductive coupling factor between 7% and 10% leads to a significant improvement in consistency compared to lower coupling factors. Finally, our results indicate that the nonlinear properties of the voltage rectifier capacitor can be neglected since these do not significantly affect the simulation results.
Highlights
During the last decade, implantable electronics have become increasingly popular for the treatment of drug-resistant diseases and as an alternative to traditional therapies using pharmaceuticals
In order to different modulations of the electrical capacitance resulting from each circuit topology, the amplitude achieve different modulations of the electrical capacitance resulting from each circuit topology, the achieve different modulations of the electrical capacitance resulting from each circuit topology, the of the sinusoidal excitation u1 t, Amp, ω was varied from 0.1 V to 10 V in 0.1 V steps at a coupling factor k of 1% and 10%
Memory consumption and computing time, the Adams, Radau5 and fourth-order Runge–Kutta method with a constant and adaptive step size and a resolution of 50 k points are most suitable in Mathcad and the Trapezoid method with a constant step size and a resolution of 50 k points is most suitable in ANSYS
Summary
Implantable electronics have become increasingly popular for the treatment of drug-resistant diseases and as an alternative to traditional therapies using pharmaceuticals. One solution concept is to use only passive electronic components to increase the degree of miniaturization and to use the intrinsic nonlinear properties of these electronic components to realize certain functionalities By applying this principle of frugal engineering, the stimulation current in implantable electronics could be determined by using the nonlinear junction capacitance of a rectifier diode without having to use sensors or other active electronic components [11]. The suitability of ferroelectric ceramic capacitors, as control elements of resonant half-bridge converters and as tuning elements of resonant circuits for wireless power transmission, has been investigated [13,14,15,16,17,18] In these applications, the intrinsic nonlinear properties of ferroelectric ceramic capacitors were used in resonant circuits. The cause of these discrepancies is investigated with the aim of improving the simulation model in terms of consistency, computing time and memory consumption
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
