Development of methods for modeling digital signals when designing printed units

Abstract

In the production of printed circuit assemblies, one of the important stages is to carry out various forms of product control. Control of the electrical parameters of signals for various modes of operation of the device is one of the key tasks, since possible deviations can lead to malfunctions in the operation of the product or inconsistency of its output characteristics with the limitations set in the technical specifications. Electrical control is carried out using test samples of products and in a number of cases the methods used are quite costly both in time and in terms of the cost of the equipment used. This article discusses the issues of building models of key parameters of digital signals. The relevance of this study is due to the need to analyze the behavior of electrical signals in preparation for the serial production of printed circuit boards, which will ultimately allow obtaining the required information about the signal and assessing its quality. The proposed model of a digital signal is universal, applicable for different values of time constants, and allows one to evaluate characteristics based on directly measured parameters of a digital signal or on the basis of a given sample. The model allows you to take into account a wide range of voltages, noise levels and parasitic parameters of circuits.