摘要:
An adjustable resistor embedded in a multi-layered substrate and method for forming the same. The adjustable resistor comprises: a planar resistor, having a plurality of terminals; and a plurality of connecting lines connected to the planar resistor, each of the connecting lines being drawn from each of the terminals of the planar resistor so as to form a resistor network, wherein the connecting lines are selectively broken by a process for drilling the substrate to form a number of combinations of opened connecting lines such that the resistance value of the adjustable resistor is varied and thus the resistance value of the adjustable resistor can be precisely adjusted.
摘要:
A multi-functional composite substrate structure is provided. The first substrate with high dielectric constant and the second substrate with low dielectric constant and low loss tangent are interlaced above the third substrate. One or more permeance blocks may be formed above each substrate, so that one or more inductors may be fabricated thereon. One or more capacitors may be fabricated on the first substrate. Also, one or more signal transmission traces of the system impedance are formed on the second substrate of the outside layer. Therefore, the inductance of the inductor(s) is effectively enhanced. Moreover, the area of built-in components is reduced. Furthermore, it has shorter delay time, smaller dielectric loss, and better return loss for the transmission of high speed and high frequency signal.
摘要:
A balanced-to-unbalanced transformer embedded with a filter, the balanced-to-unbalanced transformer being disposed in a multi-layered substrate and comprising vertically coupled transmission lines designed in different layers in the multi-layer substrate to increase transmission performances. A capacitor and a transmission line are connected to a single-ended I/O port of the balanced-to-unbalanced transformer such that a filter is embedded in the balanced-to-unbalanced transformer.
摘要:
A high frequency and wide band impedance matching via is provided. As an application to multi-layer printed circuit boards, for example, the multi-layer circuit board has several signal transmission traces, several ground layers, signal transmission vias and ground vias. The signal transmission traces and the ground layers are sited on different circuit layers, and each signal transmission trace is opposite to one of the ground layers. The signal transmission vias are connected between the signal transmission traces. The ground vias are connected between the ground layers. The ground vias are opposite to the signal transmission vias, and the ground vias corresponding to the signal transmission vias are sited to stabilize the characteristic impedance of the transmission traces.
摘要:
An embedded microelectronic capacitor incorporating at least one ground shielding layer is provided which includes an upper ground shielding layer that has an aperture therethrough; an electrode plate positioned spaced-apart from the upper ground shielding layer that has a via extending upwardly away from the electrode plate through the aperture in the upper ground shielding layer providing electrical communication to the electrode plate without shorting to the upper ground shielding layer; a middle ground shielding layer positioned in the same plane of the electrode plate, surrounding while spaced-apart from the electrode plate at a predetermined distance; a lower ground shielding layer positioned spaced-apart from the electrode plate in an opposing relationship to the upper ground shielding layer; and a dielectric material embedding the upper ground shielding layer; the middle ground shielding layer and the lower ground shielding layer.