RADIO ELECTRONIC UNIT Russian patent published in 2001 - IPC

FIELD: radio electronics. SUBSTANCE: invention can be used in design of radio electronic units receiving and processing signals of satellite radio navigation systems. Technical result consists in elimination of stray pick-ups and induced noise under conditions of arrangement of electronic radio components of various degree of integration on multilayer printed circuit board of radio electronic unit working with analog and digital signals in frequency range from one thousand Mhz to units of Hz. Single external power supply source is used to feed radio electronic unit. Proposed radio electronic unit has multilayer printed circuit board with number of conducting layers N≥6, in which printed conductors, lands and electric radio elements grouped in M zones are positioned on outer first and N-th conducting layers. First zone of M zones is zone of functional location of analog electric radio elements, following M-1 zones are zones of functional arrangement of digital electric radio elements. Ground planes of first zone are located in two inner conducting layers, second and N-1-th layers, adjacent to outer first and N-th conducting layers. Ground planes of third and following zones are located in one of inner conducting layers adjacent to first or N-th outer conducting layers. Ground planes of third and following zones are intercoupled by printing and by ground plane of first zone located in this conducting layer. Supply conductors of first zone are located between second and N-1-th conducting layers in i-th conducting layer and planes of digital supply of third and following zones are located in j-th conducting layer, where j≠i, Electric connection between zones is realized with the aid of printed conductors located predominantly on outer conducting layer adjacent to inner conducting layer in which ground planes of all zones are located. Interlayer connection of printed conductor is realized with the use of metallized holes of interlayer connection. Planes of digital supply of third and following zones and ground plane of last zone are electrically coupled correspondingly to contact elements SUPPLY and GROUND-elements feeding supply voltage from external power supply source placed on one of outer conducting layers. Leads of first element of supply filtration are directly coupled to contact elements SUPPLY and GROUND. Supply conductors of second zone where analog signals coming from first zone are converted to digital form are located in same conducting layer where supply conductor of first zone are positioned. Supply conductors of second zone come in the form of printed conductors diverging from common point electrically coupled to output lead of second element of supply filtration which is positioned on outer conducting layer of one of following zones and is coupled by its leads ( input and ground leads ) correspondingly to plane of digital supply and ground plane of zone of its location. Supply conductors of first zone come in the form of printed conductors diverging from common point electrically coupled to output lead of third element of supply filtration placed on outer conducting layer in second zone and coupled by its other leads ( input and ground leads ) correspondingly to output lead of second element of supply filtration and ground plane of second zone. EFFECT: elimination of stray pick-ups and induced noise. 5 cl, 10 dwg