Abstract:
Plural pins (3) are arranged on a printed circuit board (1) to form a generally square shape and are electrically connected to terminals of a QFP-IC (2). In the pins (3), a pin disposed at a corner portion of the generally square shape is used as a GND terminal (3a), and a pin adjoining the GND terminal is used as a source terminal (3b). A conductive region (5a) is provided to extend radially from the corner portion, and is electrically connected to the ground terminal (3a). Further, another conductive region (5b) is provided in the generally square shape and is electrically connected to the radial conductive region (5a).
Abstract:
An etched tri-metal-layer air bridge circuit board specially designed for fine-pitch applications, comprising:
an electrically insulative substrate surface (10), a plurality of tri-metal-layer bond pads (12) arranged in a generally straight row on the substrate surface (10) wherein the row defines a width direction therealong, and a circuit trace (20) arranged on the substrate surface (10), wherein the circuit trace (20) runs between two adjacent ones (22) of the plurality of tri-metal-layer bond pads (12). Each bond pad (12) comprises: (1) a bottom layer (14) attached to the substrate surface (10), the bottom layer (14) being made of a first metal and having an overall width W1 as measured along the width direction; (2) a top layer (18) disposed above and generally concentric with the bottom layer (14), the top layer (18) being made of the first metal and having an overall width W2 as measured along the width direction; and (3) a middle layer (16) made of a second metal connecting the bottom layer (14) and the top layer (18). The bond pads (12) are specially shaped such that W2 > W1 for at least the two adjacent bond pads (12), thus enabling the circuit trace (20) to be spaced closely to the bottom layers (14) of the two adjacent bond pads (12), while allowing the top layers (18) of the pads (12) to be made much larger so as to avoid delamination thereof from their associated middle layers (16).
Abstract:
A capacitor mounting structure for printed circuit boards wherein the capacitor includes first and second terminals (15a,15b) which are connected to first and second conductor planes (44,45) in the printed circuit board (B). Three vias (41,42,43) are mounted in the printed circuit board (B) in a position to be aligned with the middle of the capacitor. A first conductor pad (45) is mounted underneath one end of the capacitor and includes spaced apart extension portions (45b,45c) which electrically attach to the first (41) and third via (43). A second conductor pad (44) is mounted under the other end of the capacitor and includes a central extension portion (44b) which attaches to the second or middle via (42). In this manner, the region available for generation of parasitic inductance is minimized thereby increasing the operating efficiency of the capacitor.
Abstract:
In order to accomplish the miniaturization of a power module, the invention proposes such one which comprises a high frequency multi-stage power amplifier circuit which includes a chip part and a power amplifier semiconductor each mounted on a printed-circuit board that is firmly fixed to a heat radiation plate by fixing means like soldering, wherein there is arranged a microstrip line in an area of the printed-circuit board under a suface mounting type package in which said power amplifier semiconductor is mounted.
Abstract:
Anordnung zum Ändern und/oder Reparieren von Flachbaugruppen bei Bestückung mit SMD-Bausteinen mit einem auf der den Bausteinen (2) abgewandten Seite der Leiterplatte (1) angeordneten, vorzugsweise deckungsgleichen und mit dem unmittelbar unter den Bausteinen befindlichen Leiterbahnen (3) fluchtenden zweiten Leiterbahnmuster (4), das mit dem unmittelbar unter den Bausteinen (2) befindlichen Leiterbahnen (3) mit Hilfe von Durchkontaktierungen (6) verbunden ist.
Abstract:
An electronic device, and methods of manufacturing the same are disclosed. The method of manufacturing the electronic device includes forming a first metal layer on a first substrate, forming an integrated circuit or a discrete electrical component on a second substrate, forming electrical connectors on input and/or output terminals of the integrated circuit or discrete electrical component, forming a second metal layer on the first metal layer, the second metal layer improving adhesion and/or electrical connectivity of the first metal layer to the electrical connectors on the integrated circuit or discrete electrical component, and electrically connecting the electrical connectors to the second metal layer.
Abstract:
A heating apparatus for heating electronic components (11) on a printed circuit board (1) in low temperature environment includes a printed circuit board (1), a heating unit (2), a switch unit (3), a temperature-sensing unit (4), an electric power unit (5), and a control unit (6). The heating unit (2), the switch unit (3), the temperature-sensing unit (4), and the control unit (6) are fixed connected to the printed circuit board (1) and are electrically connected with the metal lines (12) on the printed circuit board (1). The heat source is sent to the heat-conducting layer (14) on the printed circuit board (1) through the heat-conducting terminal (22) after the switch unit (3) is conducted by the control unit (6) and the power is sent from the electric power unit (5) to the heating unit (2). Then, the electronic components (11) are heated with the heat source through the heat-conducting layer (14), so that the electronic components (11) are in the working temperatures for starting up.
Abstract:
The invention proposes an apparatus (10) for detecting fault currents in an electronic device (12), having at least one first electrical conductor (16), which carries a first electrical potential (V1), and having a sense conductor (22), which has an electrical open-circuit potential (VR), which is between the first electrical potential (V1) and a further electrical potential (V2). The apparatus (10) according to the invention is characterized by the fact that the at least one first electrical conductor (16) and the sense conductor (22) are arranged spaced apart from one another on and/or in an insulating material (24), wherein, in the event of a fault, a reduction in the insulating properties of the insulating material (24) can be identified by means of the sense conductor (22) owing to a shift in the electrical open-circuit potential (VR).
Abstract:
A data bus of a DVD+RW recorder between a DSP and a SDRAM usually needs a multilayer wiring board. In order to simplify the layout of the wiring board of the data bus there is provided a method for connecting at least a first and a second integrated circuit by providing the first integrated circuit having a plurality of first logical I/O ports physically arranged in a first order at the periphery, and providing the second integrated circuit having a plurality of second logical I/O ports physically arranged in a second order at the periphery, wherein each first I/O port is to be connected to one of said second I/O ports. The first and second I/O logical ports are connected independently from the first and/or second physical order, so that connection lines do not cross each other.