Abstract:
There is described a method to change the value of a thermally-trimmable resistor in a non-permanent way by raising the temperature of the thermally- trimmable resistor to a level that is somewhere between room temperature and trimming temperature. By doing this, the trimming range that is available via true thermal trimming may be explored without actually trimming the value of the resistor. This is possible when the thermal Iy- trimmable resistor, or a portion thereof, has an essentially non-zero temperature coefficient of resistance (TCR).
Abstract:
A multi-layer micro-printed circuit board (PCB) is disclosed, which defines a magnetic component (500), such as a transformer, using planar technology. Instead of using the traditional twelve-layer PCB incorporating both a primary and a secondary winding, this invention stacks multiple PCBs (525, 530, 535), each having four or six layers and each including a single winding (either the primary or the secondary). The PCBs are stacked in an offset arrangement such that the pins (501-504A) penetrating the PCB or PCBs including the primary winding or windings do not penetrate the PCB or PCBs including the secondary winding or windings. Additionally, this offset arrangement prevents the pins penetrating the secondary PCBs from penetrating the primary PCBs in the same manner. This offset configuration thereby avoids significant flashover problems associated with current planar components. Moreover, the invention describes an arrangement whereby a jumper or other connection can be used to connect the windings in a series or in a parallel configuration allowing the user to configure the component according to user-required parameters.
Abstract:
A tunable dielectric structure includes a first layer of dielectric material, a second layer of dielectric material positioned adjacent to the first layer of dielectric material, with the second layer of dielectric material having a dielectric constant that is less than the dielectric constant of the first layer of dielectric material, and electrodes for applying a controllable voltage across the first dielectric material, thereby controlling a dielectric constant of the first dielectric material, wherein at least one of the electrodes is positioned between the first and second layers of dielectric material. The dielectric materials can be formed in various shapes and assembled in various orientations with respect to each other. The tunable dielectric structure is used in various devices including coaxial cables, cavity antenna, microstrip lines, coplanar lines, and waveguides.
Abstract:
A diplex filter having tunable inductors. Preferably the tunable inductors include pads that may each selectively receive one end of a jumper.
Abstract:
An electronic module (20, 39, 60, 80, 132, 140, 144) includes a substrate (21), which includes a dielectric material having a cavity (40, 42, 134, 142) formed therein. First conductive contacts (44) within the cavity are configured for contact with at least one first electronic component (32) that is mounted in the cavity. Second conductive contacts (44) on a surface of the substrate that surrounds the cavity are configured for contact with at least a second electronic component (28, 30) that is mounted over the cavity. Conductive traces (36, 48) within the substrate are in electrical communication with the first and second conductive contacts.
Abstract:
A method of generating an electrical component (6) of a hearing aid electrical circuitry on a substrate (1) is suggested, wherein the electrical component is generated by material deposition and the value of a characteristic parameter of the electrical component is measured continuously during the deposition step, whereby the material deposition is terminated as soon as the measured value reaches a predetermined desired value of the monitored characteristic parameter. Thereby, a high precision of the characteristic parameters of electrical components of hearing aid electrical circuitry can be achieved without complicated trimming, tuning or adjustment elements or production steps.
Abstract:
Die Erfindung betrifft ein Substrat (1) mit mindestens einem abstimmbaren elektrischen Bauelement (2, 22), wobei in einem Volumenabschnitt (11) des Substrats mindestens ein Hohlraum (3) angeordnet ist, der teilweise mit einem zusammenhängenden Fluidband (4) eines Fluids mit einer bestimmten elektrischen Eigenschaft gefüllt ist, so dass eine Lage des Fluidbandes im Hohlraum verändert werden kann und das Fluidband derart im Hohlraum angeordnet ist, dass durch eine Veränderung der Lage des Fluidbandes im Hohlraum eine elektrische Betriebsgröße des elektrischen Bauelements verändert werden kann. Durch die Erfindung ist ein Konzept realisierbar, das als "Software Defined Radio" bezeichnet wird. Die Lage des Fluidbandes kann beliebig verändert werden. Dadurch ist es möglich, sowohl eine digitale als auch eine kontinuierliche Änderung der Betriebsgröße des abstimmbaren elektrischen Bauelements zu erreichen. Vorzugsweise ist das Substrat ein keramischen Mehrschichtsubstrat in LTCC (Low Temperature Cofired ceramics) Technologie. Das Substrat mit dem Bauelement wird beispielsweise zur Frequenzabstimmung eines Mobilfunktelefons verwendet.
Abstract:
A module part, comprising mounting parts (1), wherein a circuit substrate (3) having one or more mounting parts (1) mounted on at least one surface thereof and a connection circuit substrate (5) having recessed parts (4) or holes for fitting the mounting parts (1) therein at portions corresponding to at least one or more mounting parts (1) mounted on one surface of the circuit substrate (3) are formed integrally with each other by stacking, whereby the reliability of an inter-layer connection can be assured, a plurality of mounting parts can be accurately and densely incorporated therein, a high reliability can be provided, and a size can be reduced.
Abstract:
There is described a printed circuit board with a thermally trimmable component embedded therein. A layer of refractory insulating material is provided to provide mechanical support and chemical passivation for the thermally trimmable component. The component is trimmed by applying a sequence of heat pulses the a heating element, which could be the component itself or a separate element. A cavity may be burned in the substrate to provide thermal isolation for the thermally trimmable component.