M.A. Romashchenko - Ph.D. (Eng.), associate professor, Voronezh State Technical University. E-mail: kipr@vorstu.ru

Noise immunity of radio-electronic means in many respects is defined by noise immunity of the printed circuit board (PCB). The offered technique allows to carry out the analysis and to evaluate stability of PCB to crosstalk, to noise of feeding circuits, to an electrostatic discharge and to a magnetic field. This stage is a component of a method of topological verification of support of requirements EMC in radio-electronic means constructions. The analysis technique noise immunity of PCB is provided by a set of procedures given and consists of the following steps: Step 1. The «Crosstalk immunity» procedure for circuits with the S3 attribute (the most susceptible circuits) calculates level of crosstalk and compares to a noise margin. Step 2. The «Stability to Noise of Feeding Circuits» procedure for circuits with the S3 attribute defines a level of influence of noise of feeding buses directed through components or printing conductors. Step 3. The «Stability to an Electrostatic Discharge» procedure diagnoses PCB traces on unwanted ways of currents of ESR through outputs with the S2 and S3 attributes. Step 4. The «Stability to a Magnetic Field» procedure evaluates the interference voltage, S3 directed in a circuit an outside magnetic field. Based on the carried-out analysis the decision on compliance of level of noise immunity of PCB to required values is made.