Analog-digital hybrid PCB ground plane structure based on high-speed AD and design method

Abstract

The invention discloses an analog-digital hybrid PCB ground plane structure based on a high-speed AD and a design method, the analog-digital hybrid PCB ground plane structure comprises an analog ground and a digital ground which are incompletely segmented in a PCB ground plane, and incomplete segmentation means that a common ground space of the analog ground and the digital ground is reserved in asegmentation line. According to the invention, a brand-new ground plane design form is adopted; namely, the analog ground and the digital ground adopt an incomplete segmentation form; a common-groundcopper sheet in proper width is reserved in the middle of the upper portion of a high-speed AD chip, it can be guaranteed that an analog circuit has the enough anti-interference capacity for a digital circuit while outward radiation of high-speed digital signals is achieved as small as possible, and the structure is easy to design and implement and easy to develop.

Description

technical field [0001] The invention belongs to the field of PCB boards, and in particular relates to a high-speed AD-based modular-digital hybrid PCB ground plane structure and a design method. Background technique [0002] With the development of technology in the electronics industry, the application and requirements of high-speed AD acquisition are getting higher and higher. Generally, the boards and cards that require high-speed AD acquisition include high-speed digital circuits. In this case, those that affect the excellent performance of high-speed AD There are many design factors, and it is becoming more and more difficult to design a good AD index. Among many factors, the design of analog ground and digital ground is particularly critical. Under the current technical background, there are generally two types of processing for analog ground and digital ground. One is that the analog ground and digital ground are completely separated, and the remote analog power groun...

AI Technical Summary

Problems solved by technology

Under the current technical background, there are generally two types of processing for analog ground and digital ground. One is that the analog ground and digital ground are completely separated, and the remote analog power ground and digital power ground are used for common ground. The advantage is that the analog circuit Anti-digital circuit interference is better, but the disadvantage is that the high-speed digital signal of AD returns too far, resulting in large digital signal radiation and increasing crosstalk; one is that it does not distinguish between analog ground and digital ground, and does not perform any division on the ground plane on the PCB. The advantage is that the high-speed digital signal of AD can be reflowed nearby, and the external radiation of the high-speed digital signal is the smallest. performance

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