| 摘要 |
radio-electronics; receiving and processing signals from satellite radio navigation systems. SUBSTANCE: radio-electronic unit has multilayer printed-circuit board whose external conducting layers carry printed-circuit tracks, contact pads, electrical and radio components, high-frequency connector for receiving antenna and low-frequency connector for peripheral devices, remaining printed-circuit tracks being disposed in its internal conducting layers. Electrical and radio components are assembled in regions of which first one accommodates electrical and radio components for reception and frequency conversion of signals and second region holds those designed for digital processing of signals. First region relates to first and second shielding ground planes provided in internal second and last but one conducting layers and second region, to third shielding ground plane and also to power plane. Power conductors of electrical and radio components in first region and power conductor interconnecting output lead of power switch and input lead of receiving-antenna power filter are concentrated in one internal conducting layer between internal second and last but one conducting layers, total number of internal conducting layers being minimum three. Mentioned power conductors of electrical and radio components are made in the form of printed-circuit tracks fanning out from branching node disposed within first region; it is essentially equipotential area. Vacant sections of this area are used as ground sections connected to first and second shielding ground planes. Center of branching node is connected to output lead of first power filter whose input lead is connected through separate printed-circuit track to output lead of second power filter; connected to the latter is also power plane related to second region. Electrical and radio components of different types disposed on multilayer printed-circuit board as well as receiving antenna are supplied with power from common external power source. EFFECT: eliminating stray pick-ups and induced noise on printed-circuit board where electrical and radio components are compactly disposed. 5 cl, 9 dwg
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