Embedded passives

Emamectin (Slice), registered for use in aquaculture in Europe, 3 220t Emamectin benzoate, 14 347 Emanuel Tire process, 21 470—471 Embedded passives, 10 15 Embedding, 10 1-30. See also Encapsulation... 

Applications that have received attention, and the material properties that enable them, are shown in Figure 27.1. These applications are reviewed in detail in Waser and Ramesh. Decoupling capacitors and filters on semiconductor chips, packages, and polymer substrates (e.g., embedded passives ) utilize planar or low aspect ratio oxide films. These films, with thicknesses of 0.1 to 1 J,m, are readily prepared by CSD. Because capacitance density is a key consideration, high-permittivity materials are of interest. These needs may be met by morpho-tropic phase boundary PZT materials, BST, and BTZ (BaTi03-BaZr03) solid solutions. Phase shifters (for phase array antennas) and tunable resonator and filter applications are also enabled by these materials because their effective permittivity exhibits a dependence on the direct current (DC) bias voltage, an effect called tunability. 

Advanced Embedded Passives Technology final report, http //aept.ncms.org/about. htm... 

Table 1.4 summarizes the major application/market segment and the technical attributes that influence the selection of ceramic interconnect technology in that segment. As shown in this table, thermal management — thermal performance, thermal stability, and high-temperature operation as it relates to both operating environment and lead-free assembly — is common to most applications. High-performance electrical property, and the related interconnect density, direct die attach, and embedded passives or embedded functions also span many applications. This comparison demonstrates that many... 

A typical design cycle for multilayer circuits with embedded passives. 

Wang, G., Folk, M., Elshabini, A., and Barlow, E, Embedded passives in LTCC for RF and microwave applications, European Microelectronics and Packaging Symposium, Prague, Czech Republic, June 16-18, 2004. 

Prismark Partners LLC, Pushing the Shrinking Envelope — A Status Report on Embedded Passives in PCBs, Cold Spring Harbor, NY, December 2000. Thust, H., Thelemarm, T., Ehrhardt W, Driie, K.-H, Muller, J., Embedded components and functions in LTCC - review and prospect. Proceedings of Ceramic Interconnect Technology The Next Generation, Denver, CO, April 2003, invited paper. 

IPC-2614, Sectional Requirements for Board Fabrication Documentation (Printed Circuit Board Description Including Embedded Passives) ... 

Embedded passives and embedded waveguides are complicated to implement in production. Alignment and overlap are critical. Proper scaling for the particular embedded materials is especially important, depending on whether the materials are additive or subtractive. Eigure 20.18 shows some of the critical tooling dimensions. 

FIGURE 20.18 Critical tooling data for embedded passives. 

Embedded passive component Embedded passive component (Formed type) (Inserted type)... 

Embedded passives-designing tor the future FIGURE 21.2 Resistor terminations. 

Requirements for special test methods (time domain reflectometry [TDR], embedded passives, etc.)... 

The trend in surface-mount technology is to use smaller passive devices such as capacitors, resistors, and inductors. Also, there is the use of embedded passive devices, that is, resistors and capacitors that are located within the circuit board laminate. Embedded passive devices free up additional surface area for larger, active components. 

Various new processes have been developed to build functional elements and devices on the flexible substrates. They have been generating more functions than wiring or assembling board of the discrete components. They are the similar ideas as embedded passive technologies of multilayer boards, but they generate more values with flexible substrates. Table 66.2 shows several material examples and applications. 

As explained above, in LTCCs that incorporate a variety of materials with embedded passive components, especially where fine wiring is used, it will be beneficial to develop LTCCs that use mainly silver. However, in circuit board applications consisting of conductor and insulating materials with fine... 

Thick film Usually BaTiOj-based paste with glass adhesion promoters fired onto substrate ltf-10"> Embedded passives in hybrid circuits... 

R.Djakaria, B.I.Chandran,. H.Gordon,cW.F.Schimidth, Determination of Youngs Modulous of thin Films used in embedded passive devices... 

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