Digital signal impedance match circuit designing method

Abstract

The invention discloses a digital signal impedance match circuit designing method. A PCB plate layer required is designed according to circuit complicate conditions; each layer is defined with different features; an impedance match circuit is employed; a schematic diagram is designed in a simulation system; input or output features of each device is activated; and different matching effects can be simulated via inputting different impedance, capacitance value, inductance value and walking line length values. By the use of the technical scheme, a digital circuit designer can design the impedance match circuit for a to-be-designed circuit in the simulation system, so well-designed and fixed circuit can be directly applied to a practical circuit and a debugging link for the practical circuit can be reduced; a large amount of time can be reduced and circuit designing accuracy can be improved; in particular, for high-frequency and radio-frequency circuit designs, debugging and rectifying links can be greatly reduced; and the circuit can be designed once for all and high output digital signal precision can be achieved.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a design method of a digital signal impedance matching circuit. Background technique [0002] In recent years, with the development of electronic technology, the application of high-speed digital circuits has become more and more extensive. In fact, with the increasing frequency of digital signals on PCB printed circuit boards, how to ensure the integrity of signals on PCBs has become another focus of people's attention besides realizing circuit functions. The reasonable component layout of PCB, the division of PCB circuit layers, the width and length of traces between components on PCB, etc. will directly determine whether the circuit design with achievable functions in the schematic diagram can work normally after forming the PCB. Signal integrity refers to the quality of transmission of a signal on a transmission line. There are many reasons that affect signal integr...

AI Technical Summary

Problems solved by technology

Impedance matching is an important link in signal integrity theory. If the signal transmission line on the PCB is too long, the signal frequency transmitted on the transmission line is too high, and no impedance matching measures are taken, the signal transmission will often be greatly affected. not working properly

[0003] However, it is a very complicated process to design a circuit completely according to theoretical calculations to achieve impedance matching. Chips, the digital characteristics of digital chips are not exactly the same, so designers seldom choose this method, and design the circuit more according to the actual situation and their own work experience, but the designed circuit is due to the existence of "experience value". ", often the circuit after the design is completed needs to be continuously debugged and improved in the actual debugging process, which greatly prolongs the product development cycle