摘要:
The present invention provides a circuit and method for a fringing capacitor. The fringing capacitor includes at least two conductor layers spaced apart from each other. Each conductor layer includes at least two portions. The portions include odd ones alternating with even ones. Adjacent odd ones and even ones of the portions are spaced apart. The odd ones of the portions on a first one of the conductor layers are configured to substantially overlay the odd ones of the portions on an adjacent one of the conductor layers. The even ones of the portions on the first one of the conductor layers are configured to substantially overlay the even ones of the portions on the adjacent one of the conductor layers. The odd ones of the portions on the first one of the conductor layers are electrically coupled together and to the even ones of the portions on the adjacent one of the conductor layers, thereby defining a first electrode. The even ones of the portions on the first one of the conductor layers are electrically coupled together and to the odd ones of the portions on the adjacent one of the conductor layers, thereby defining a second electrode. A dielectric is interposed between the first and second electrodes. A guardband is spaced from the first and second electrodes.
摘要:
A capacitive element for a circuit board or chip carrier having improved capacitance and method of manufacturing the same is provided. The structure is formed from a pair of conductive sheets having a dielectric component laminated therebetween. The dielectric component is formed of two or more dielectric sheets, at least one of which can be partially cured or softened followed by being fully cured or hardened. The lamination takes place by laminating a partially cured or softened sheet to at least one other sheet of dielectric material and one of the sheets of conductive material. The total thickness of the two sheets of the dielectric component does not exceed about 4 mils and preferably does not exceed about 3 mils; thus, the single dielectric sheet does not exceed about 2 mils and preferably does not exceed about 1.5 mils in thickness. The use of two or more sheets of dielectric material makes it very unlikely that two or more defects in the sheets of dielectric material will align, thus greatly reducing the probability of a defect causing a failure in test or field use.
摘要:
The multilayer ceramic capacitor has a plurality of dielectric layers and inner layers laminated alternately laminated on one another. In each of the dielectric layers, the rate of ceramic grain which form the dielectric layers and present singly in one dielectric layer over its entire longitudinal thickness is set to amount to 20% or more. The multilayer ceramic capacitor can prevent a decrease in a CR product to a value lower than a desired level even if the dielectric layer becomes as thin as 5 &mgr;m or less. This can comply with demands for a multilayer ceramic capacitor that the number of the dielectric layers to be laminated on the inner electrodes should be increased yet the thickness of the dielectric layers should be made thinner in order to meet requirements for making electronic circuit more compact in size and higher in density.
摘要:
The present invention provides a thin-film capacitor which can easily meet requirements of reduction in size, thickness, and weight and which can perform temperature compensation. In addition to the features described above, the present invention provides a thin-film capacitor having a superior Q factor in a high frequency band. The thin-film capacitor of the present invention has at least one first dielectric thin-film and at least one second dielectric thin-film having a dielectric constant different from that of the first dielectric thin-film, wherein these thin-films are provided between a pair of electrodes. In addition, in the present invention, the absolute value of the temperature coefficient of capacitance of the first dielectric thin-film is 50 ppm/° C. or less, and the temperature coefficient of capacitance of the second dielectric thin-film is a negative value and has an absolute value of 500 ppm/° C. or more.
摘要:
An improved thin-film capacitor and methods for forming the same on a surface of a substrate are disclosed. The capacitor includes a bottom conducting plate formed by depositing conductive material within a trench of an insulating layer and planarizing the conducting and insulating layers. A dielectric film is then deposited on the substrate surface, such that at least a portion of the dielectric material remains over the bottom conducting plate. The dielectric film is formed by depositing a first layer of dielectric and then immersing the top of the first layer of dielectric in gaseous plasmas in a single or a series of steps to change the composition of the first layer of deposited dielectric stack. The additional steps of immersion in a plasma is used to improve the desired performance of the dielectric for capacitor applications such as improved reliability, reduced leakage currents and for tuning voltage coefficients of the capacitor. A second conductive layer is then deposited over the surface of the substrate, patterned and etched such that at least a portion of the second conducting material resides over at least a portion of the dielectric material.
摘要:
Invention refers to an electric component, preferably a component buried in a Printed Circuit Board (PCB) including at least two conductive layers (13,21, 36; 15, 35) and an intermediate layer (14, 37). The intermediate layer (14, 37) further consists of at least two layers (16, 17, 22, 23, 38, 39, 40): at least a first layer (17, 23, 39) and a second layer (16, 22, 38, 40), which at least first layer has more elastic characteristic than the second layer (16, 22, 38, 40) at a certain temperature and/or pressure.
摘要:
A multilayer ceramic capacitor includes a multilayer ceramic body having alternately stacked ceramic layers and internal electrodes, the ceramic layers containing therein an acceptor representing one or more metallic elements for facilitating a reoxidation process of the multilayer ceramic body, and a pair of external electrodes installed at two opposite sides of the multilayer ceramic body, wherein the acceptor concentration in the ceramic layers stacked at a central portion of the multilayer ceramic body is higher than that in the remaining ceramic layers of the multilayer ceramic body.
摘要:
A film capacitor includes a novel hybrid polymeric film dielectric in which at least one non-polar dielectric homopolymer resin is blended homogeneously in solid-solution with at least one other dielectric polymer resin. The properties of at least one of the dielectric polymer resin constituents of the hybrid polymeric film dielectric are selected to produce a tailored property or properties of the solid-solution blend thereof. The non-polar homopolymer serves to stabilize the hybrid polymeric film. In the film capacitor configuration, the hybrid polymeric film is tightly sandwiched between conformable metal plates.
摘要:
A capacitor has a pair of plates separated by a capacitor dielectric material which is formed of multiple separate layers of different dielectric materials having different electrical characteristics. The different electrical characteristics are represented by linearity curves that curve relatively oppositely with respect to one another. Combining the different dielectric materials and separate layers achieves selected electrical characteristics from the overall capacitor dielectric material. The capacitor dielectric material may be formed with a top layer, a middle layer and a bottom layer. The middle layer may be formed of relatively high leakage dielectric and/or relatively high dielectric constant material, and the top and bottom layers may be formed of barrier material which is substantially resistant to leakage current and which exhibits a relatively lower dielectric constant.
摘要:
A capacitive element for a circuit board or chip carrier having improved capacitance and method of manufacturing the same is provided. The structure is formed from a pair of conductive sheets having a dielectric component laminated therebetween. The dielectric component is formed of two or more dielectric sheets at least one of which can be partially cured or softened followed by being fully cured or hardened. The lamination takes place by laminating a partially cured or softened sheet to at least one other sheet of dielectric material and one of the sheets of conductive material. The total thickness of the two sheets of the dielectric component does not exceed about 4 mils and preferably does not exceed about 3 mils; thus the single dielectric sheets does not exceed about 2 mils and preferably does not exceed about 1.5 mils in thickness. The use of two or more sheets of dielectric material makes it very unlikely that two or more defects in the sheets of dielectric material will align thus greatly reducing the probability of a defect causing a failure in test or field use.