Abstract:
A multi-layer wiring board comprises an insulating substrate having, on a central part of its top surface, a semiconductor device mounting portion and having, on its under surface, an external electrode. The insulating substrate includes a multilayered wiring having a first group of parallel wiring lines; a second group of parallel wiring lines arranged orthogonal thereto; and a group of through conductors for providing electrical connection therebetween. Power is supplied from the external electrode to the semiconductor device through built-in capacitors formed therewithin. The built-in capacitors are connected in parallel that have different resonance frequencies within a range from an operating frequency band for the semiconductor device to a frequency band for a harmonic component, and at an anti-resonance frequency occurring between the different resonance frequencies, a composite impedance is equal to or below a predetermined value.
Abstract:
A filter circuit includes a first distributed parameter RC circuit having a first distributed parameter resistor and a first distributed parameter capacitance and a second distributed parameter RC circuit having a second distributed parameter resistor and a second distributed parameter capacitance, wherein one end of each of the first and second distributed parameter resistors connected in parallel is connected to an input terminal of a buffer circuit and the second distributed parameter capacitance is connected to an output terminal of the buffer circuit, and when the number of distributed parameter RC circuits connected in parallel is n, which can be two or more, the number of distributed parameter capacitances connected to the output terminal of the buffer circuit is one to nnull1.
Abstract:
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.
Abstract:
A novel capacitor foil and printed circuit board intermediate made using that foil are disclosed. The capacitor foil is a two-layer construction having a conductive layer and a partially cured bonding layer having a high dielectric constant. The high dielectric bonding layer is formed with epoxy or other polymer and is loaded with capacitive ceramic particles or pre-fired ceramic forming particles. The resulting capacitor foil may be applied to a laminate having copper patterns thereon to define a PCB intermediate containing at least one buried capacitor device. Multiple layers of capacitance material also can be used to increase the overall capacitance of the board.
Abstract:
An interconnect structure has a plurality of planar interconnects (1, 2) mutually superposed with a prescribed distance therebetween and serving as interconnects between two circuit boards (A, B), each of the planar interconnects (1, 2) having at least two connection terminals (1A, 1B, 2A, 2B) at the circuit boards (1, 2). Rather than using rigid wire interconnects as done in the past to make interconnections, planar interconnects having relatively large surface areas are used to increase the line-to-line capacitance, thereby enhancing the filtering function that reduces high-frequency noise.
Abstract:
An insulation layer is formed on a ground layer. The insulation layer includes first and second regions for forming wiring layers. The impedance of a wiring layer formed on the second region is lower than that of a wiring layer formed on the first region. A signal line pattern is formed on the wiring layer on the first region of the insulation layer. A power supply plane is formed on the wiring layer on the second region of the insulation layer in order to feed power to the signal line pattern through a termination resistor connected to the signal line pattern.
Abstract:
A multi-layer electronic device package includes first and second outer layers and at least one signal layer disposed between the outer layers. The signal layer includes signal traces and ground traces interleaved with the signal traces. A method of routing signal traces in an electronic device package includes the acts of disposing a plurality of signal traces in at least one substrate layer, and interleaving a plurality of ground traces with the signal traces.
Abstract:
Signal wirings 22, 23 are formed on a pair of substrates 20, 21, and the substrates are joined together through an insulating layer 24 so that the signal wirings 22, 23 are placed in parallel and facing to each other. The surfaces of the overlapping faces of the signal wirings 22, 23 are made smooth, and the roughness of the same surfaces is smaller than the skin depth nulls due to the skin effect, preferably less than one third, for minimizing the increase in the electric resistance due to the skin effect.
Abstract:
A microwave broadside coupled balun integral in a multi-layer printed wiring board formed by broadside coupled conductors embedded in the multi-layer printed wiring board. The balun may be used to form components which are integrated into the multi-layer printed wiring board, such as a microwave mixer formed by two of said broadside coupled baluns embedded in a multi-layer printed wiring board and connected to a diode ring quad.
Abstract:
A multi-layer electronic device package includes first and second outer layers and at least one signal layer disposed between the outer layers. The signal layer includes signal traces and ground traces interleaved with the signal traces. A method of routing signal traces in an electronic device package includes the acts of disposing a plurality of signal traces in at least one substrate layer, and interleaving a plurality of ground traces with the signal traces.