Multilayer Chip Lc Devices Are Designed With The Rf Equivalent Circuit Model

The technology of Low Temperature Co-fired Ceramics and Ferrites (LTCC<CF) can satisfy the requirements of miniaturization, lower cost and higher frequency applications in the development of modern electronic systems. Nowadays it has become to the major and key technology for passive integration. Fundamental technology of passive integration in LTCC<CF have been studied in this thesis which surround the LTCC<CF process, design of passive components and modeling the high frequency equivalent circuit for LTCC embedded inductors.The effect of variation of geometrical parameters on embedded passive components performance has been simulated by Ansoft HFSS software and obtained some valuable reference results for designing. In condition of the detail proportion of length and width in the size of 0805, inductance estimated formula of the embedded ferrite inductors has been modified. The silk screen for component of 0805 size has been designed and prepared. The inductor samples with inductance 550nil and 150nH, and capacitor sample with 35pF have been prepared by LTCC process. The results of measurement basically accord with the designing. Micro-structure analyzing of section plane shows that one of the most important reason which influence the performance of the component is the accurate position of printing geometry. The technology of passive integrated LC filter has been studied using the same 0805 silk screen. The passive integrated low pass LC filters with the cut-off frequency 70MHz, 120MHz, 230MHz respectively have been designed and prepared. The testing fixture has been designed and fabricated also to measure the S parameter of the filter. The cut-off frequency of filter is basically consistent with the design value and small deviations existed. It has proved that parameterized design of inductors and capacitors is correct in passive integrated module, which validate the accuracy of the simulation results of parameterized design of the device under the low-frequency. The results show that Ansoft HFSS software can be effectively used to achieve accurate design of LTCC<CF passive components. The performance of the component can be agree with the designing value based on the optimized process. According to the literature, focusing on derivation of the T broadband equivalent circuit model of the inductor at high frequency. The equivalent circuit model of the ideal lossless transmission line has been derived and verificated by the ideal lossless transmission line with 75 Ohm impedance, which the corresponding frequency of electrical lengthπis 2GHz, 5GHz, 8GHz respectively. The T equivalent electric circuit model of inductor at high frequency has been established using the method of combination matrix Y with Z which simplify the process of derivation. The conclusion is consistent with the result of literature. The typical spiral inductor used to verify high-frequency T equivalent circuit model. At the range of the first order self-resonant frequency, the result of electromagnetic field simulation by HFSS is agree with the result of T equivalent circuit model simulated by ADS software. The high frequency equivalent circuit model of arbitrary structure passive components can be established using the same thought, which facilitate circuit simulation and foundation of passive components integrated database.