Patent ID: 6437991
Filing Date: 2002-08-20
Classification: H05K

Abstract:
An electronic unit comprising a multilayer printed-circuit card, in which the interface connections of the printed conductors are carried out by means of the metallized holes of the interface connections, in which the external conductive layers have conductors, contact areas and electronic components, and the internal conductive layers have conductors and metallized ground and power supply planes with windows around the metallized holes of the interface connections which are not electrically connected with these planes, characterized in that the electronic components and printed conductors of the card are grouped together in three sequentially located zones, first of which corresponds to the zone of allocation of the electronic components performing the analog conversion of the signals from the satellite radio navigation systems, second one corresponds to the zone of allocation of the electronic components performing the analog-digital conversion of the signals, and third one corresponds to the zone of allocation of the electronic components performing the digital conversion of the signals, the electronic components being mounted on a printed-circuit card with six conductive layers, where the internal second conductive layer has ground planes in each zone, the third conductive layer has a power supply conductors of the first and second zones and additional conductors of the third zone, the fourth conductive layer has additional conductors of the first and second zones and a metallized power supply plane of the third zone, the fifth conductive layer has a ground plane of the first zone and additional conductors of the second and third zones, in which case the ground planes made in the second conductive layer of the card are interconnected by means of direct ground linking conductors located according to the layout of the linking signal conductors effecting electrical connections between the zones in the external first and sixth conductive layers of the card, the first zone being surrounded along its perimeter by screening wires allocated opposite to each other in the first and sixth conductive layers of the card, said screening wires being interconnected and connected to the ground planes of the given zone in the second and fifth conductive layers of the card by means of the metallized holes made therein to form a closed electric circuit; said screening wires having breaks for passing the respective linking signal conductors, in which case the breaks of the screening wires in the first and sixth conductive layers of the card correspond to the continuous metallized portions of the ground planes in the second and fifth layers of the card.