摘要:
Fabricating (100, 1300) a printed circuit board includes fabricating patterned conductive traces (305, 310, 1410, 1415) onto a foil, laminating the patterned conductive traces to a printed circuit board substrate (405, 1505) by pressing on the foil, such that the conductive traces are pressed into a dielectric layer of the printed circuit board, and removing the foil to expose a co-planar surface of conductive trace surfaces and dielectric surfaces. Removal may be done by peeling (125) and/or etching (130, 1315).
摘要:
Embedded capacitors comprise a bimetal foil (500) that includes a first copper layer (205) and an aluminum layer (210) on the first copper layer. The aluminum layer has a smooth side adjacent the first copper layer and a high surface area textured side (215) opposite the first copper layer. The bimetal foil further includes an aluminum oxide layer (305) on the high surface area textured side of the aluminum layer, a conductive polymerlayer (420) on the aluminum oxide layer, and a second copper layer (535) overlying the aluminum oxide layer. The bimetal foil may be embedded in a circuit board (700) to form high value embedded capacitors.
摘要:
In one embodiment, a peelable circuit board foil (200) has a metal support layer (205) and a conductive metal foil layer (210) bonded by an inorganic high temperature release structure (215) that comprises a co-deposited layer (250) and a metal oxide layer (260). The co-deposited layer comprises an admixture of nickel and one or more of boron, phosphorus, and chromium. In a second embodiment, the peelable printed circuit foil (200) has a crystallized dielectric oxide layer (405) disposed on the metal foil layer and an electrode layer (415) disposed on the crystallized dielectric oxide layer, forming a dielectric peelable circuit board foil (400) that may be adhered to a layer of a flexible or rigid circuit board, after which the metal support layer can be peeled away, leaving a capacitive structure including the metal foil layer, the crystallized dielectric oxide layer, and the electrode layer.
摘要:
A dielectric sheet (500, 600, 1621) includes a photodielectric support layer (505, 1630) that may be glass reinforced and a dielectric laminate (510, 605). The dielectric laminate includes first and second metal foil layers (415, 660; 210, 665, 1605, 1610), and a dielectric layer (405, 655, 1620) disposed between the first and second metal foil layers. The first metal foil layer is adhered to the photodielectric support layer. In a printed circuit and patch antenna that includes the dielectric sheet, the first metal layer is patterned by removal of metal according to a circuit pattern and the photodielectric support layer is patterned by removal of dielectric material according to the circuit pattern.
摘要:
The invention provides an integrated device with corrosion-resistant capped copper bond pads. The capped copper bond pads include at least one copper bond pad on a semiconductor substrate. An activation layer comprising one of immersion palladium, electroless cobalt, or immersion ruthernium is disposed on the copper bond pad. A first intermediate layer of electroless nickel-boron alloy is disposed on the activation layer. A second intermediate layer comprising one of electroless nickel or electroless palladium is disposed on the first intermediate layer, and an immersion gold layer is disposed on the second intermediate layer. A capped copper bond pad and a method of forming the capped copper bond pads are also disclosed.
摘要:
One of a plurality of capacitors embedded in a printed circuit structure includes a first electrode (415) overlaying a first substrate layer (505) of the printed circuit structure, a crystallized dielectric oxide core (405) overlaying the first electrode, a second electrode (615) overlying the crystallized dielectric oxide core, and a high temperature anti-oxidant layer (220) disposed between and contacting the crystallized dielectric oxide core and at least one of the first and second electrodes. The crystallized dielectric oxide core has a thickness that is less than 1 micron and has a capacitance density greater than 1000 pF/mm2. The material and thickness are the same for each of the plurality of capacitors. The crystallized dielectric oxide core may be isolated from crystallized dielectric oxide cores of all other capacitors of the plurality of capacitors.
摘要翻译:嵌入印刷电路结构中的多个电容器之一包括覆盖印刷电路结构的第一衬底层(505)的第一电极(415),覆盖第一电极的结晶化电介质氧化物芯(405),第二电极 615),以及设置在结晶的电介质氧化物芯和第一和第二电极中的至少一个之间并与其接触的高温抗氧化剂层(220)。 结晶的电介质氧化物芯的厚度小于1微米,电容密度大于1000pF / mm 2。 多个电容器的材料和厚度相同。 结晶的电介质氧化物芯可以与多个电容器的所有其它电容器的结晶的电介质氧化物芯隔离。
摘要:
A method for manufacturing a microelectronic assembly to have aligned conductive regions and dielectric regions with desirable processing and dimensional characteristics. The invention is particularly useful for producing integral capacitors, with the desired processing and dimensional characteristics achieved with the invention yielding predictable electrical characteristics for the capacitors. The method generally entails providing a substrate with a first conductive layer, forming a dielectric layer on the first conductive layer, and then forming a second conductive layer on the dielectric layer. A first region of the second conductive layer is then removed to expose a first region of the dielectric layer, which in turn is removed to expose a first region of the first conductive layer that is also removed. From this process, the first regions of the conductive and dielectric layers are each removed by using the overlying layer or layers as a mask, so that the remaining second regions of these layers are coextensive.
摘要:
A thin-film metal resistor (44) suitable for a multilayer printed circuit board (12), and a method for its fabrication. The resistor (44) generally has a multilayer construction, with the individual layers (34, 38) of the resistor (44) being self-aligned with each other so that a negative mutual inductance is produced that very nearly cancels out the self-inductance of each resistor layer (34, 38). As a result, the resistor (44) has a very low net parasitic inductance. In addition, the multilayer construction of the resistor (44) reduces the area of the circuit board (12) required to accommodate the resistor (44), and as a result reduces the problem of parasitic interactions with other circuit elements on other layers of the circuit board (12).
摘要:
A thick-film resistor and a process for forming the resistor to have accurate dimensions, thereby yielding a precise resistance value. The resistor generally includes an electrically resistive layer and a pair of terminals, a first of which is surrounded by the second terminal, so as to form a region therebetween that surrounds the first terminal and separates the first and second terminals. The terminals are preferably concentric, with the second terminal and the region therebetween being annular-shaped. The resistive layer electrically connects the first and second terminals to complete the resistor. Each of the terminals has a surface that is substantially parallel to an upper and/or lower surface of the resistive layer and contacts the resistive layer. The surfaces of the terminals may be embedded in the resistive layer by printing the resistive material over the terminals, or may contact the upper or lower surface of the resistive layer by locating the terminals above or below the resistive layer. In each of these embodiments, the terminals are not limited to having edge-to-edge contact with the resistive layer, such that the interfacial resistance therebetween is minimized.
摘要:
A process for forming a laminate with capacitance and the laminate formed thereby. The process includes the steps of providing a substrate and laminating a conductive foil on the substrate wherein the foil has a dielectric. A conductive layer is formed on the dielectric. The conductive foil is treated to electrically isolate a region of conductive foil containing the conductive layer from additional conductive foil. A cathodic conductive couple is made between the conductive layer and a cathode trace and an anodic conductive couple is made between the conductive foil and an anode trace.