Abstract:
A printed circuit board structure includes a signal reference layer (340) exposed at the surface of the printed circuit board (300). Through the large-area copper material of the signal reference layer (340) having a good heat conduction properties, the heat generated by thermal devices (360) located on the opposite surface of the printed circuit board (300), can be dissipated by convection in the environment surrounding the printed circuit board (300) to achieve a good heat dissipation effect.
Abstract:
Un circuit hyperfréquence comprend un empilement de couches diélectriques (Di), avec au moins une couche conductrice formant plan-masse (PMj). Des liaisons conductrices (SMk) sont prévues en au moins un niveau d'interface entre couches diélectriques (Di). L'empilement contient plusieurs plans-masse (PM1-PM5), alternés avec plusieurs niveaux de liaisons conductrices (SM1-SM4), chaque niveau de liaisons conductrices se trouvant ainsi pris en sandwich entre deux plans-masse. Des dégagements (E) découvrant un niveau de liaisons conductrices (SM4) sont également prévus en partie supérieure de l'empilement, chaque dégagement étant conformé pour loger opérativement une puce d'élément actif hyperfréquence dont les entrées/sorties et l'alimentation proviennent de niveaux inférieurs de liaisons de l'empilement, atteints par des trous métallisés (MHp), lesquels traversent des plans-masse (PMj) au niveau d'épargnes de ceux-ci.
Abstract:
Multiple circuit functions embodied in electrical circuit lines and areas are supported by a multilayered printed circuit board of various lengths and widths (defining "x" and "y" directions) and of various thicknesses (defining a "z" direction) all on a single board. Several ways of achieving such variations in thickness include providing two layer subassemblies arranged in an alternate and intermediate manner, one subassembly being adapted to support electrical circuit lines and areas, and the other subassembly being formed of thin film dielectric material of various precalculated thicknesses. Another way of achieving a variation in thickness is to limit the surface covered by circuit lines with a pre-calculated core thickness.
Abstract:
A printed circuit board backpanel (100) uses strip-line construction to allow emitter coupled logic (ECL) signals and transistor-transistor logic (TTL) signals on the same signal layer, while providing electromagnetic interference (EMI) emission control. Disposed between ground layers (102,130), and separated bydielectric layers (104, 108, 112, 116, 120, 124, 128), are arranged signal layers (106, 114, 118, 126) and power layers (110, 122).
Abstract:
A high density multilayer printed circuit board comprising signal layers (C), electric source layers (B), and ground layers (G), with insulating layers arranged between the signal layers and the electric source layers, between the electric source layers and the ground layers, and between the ground layers and the signal layers. Conductor portions (5a. 5b, 5c) forming through holes (6a, 6b, 6c) are opened in a perpendicular direction to the signal layers, electric source layers, and ground layers. The conductor portions are electrically connected to the signal layers and/or the electric source layers, and/or the ground layers, through lands (3a, 3b, 3c) thereof, the connections of the lands being substantially equally distributed among the conductor portions.
Abstract:
A multilayer printed circuit board for TTL logic components provides an approximate 100 ohm characteristic impedance between external microstrip signal lines and internal ground and voltage planes. The addition of two internal microstrip signal plane lines permits a much greater interconnectability capability and also saves a large percentage of spatial area for component mounting while still maintaining the 100 ohm impedance characteristic.