Grounding method and circuit board of digital-analog hybrid circuit

Abstract

A grounding method for a digital-analog circuit and a circuit board, the method is based on circuit board settings, including: setting a control chip; setting a digital circuit and an analog circuit; setting a first connection path, connecting the ground terminals of the digital circuit together, setting The second connection path connects the ground terminal of the analog circuit in common; connects the first connection path and the second connection path with a connection conductor at the position covered by the control chip, and connects the The connection conductor or the first connection path is connected to the power supply ground. After the digital-analog mixed control chip and its peripheral analog circuit and the ground terminal of the peripheral digital circuit are connected together through the connection path, a connecting wire under the control chip is connected to form a single-point grounding of the digital-analog circuit, and the current of the connecting wire The path is very narrow, which can effectively suppress the loop current, thereby suppressing the noise; the ground wire is short, and the signal return flow is short and complete, thus solving the interference between the analog circuit and the digital circuit.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a grounding method for a digital-analog hybrid circuit and a circuit board. Background technique [0002] In the current stage of electronic appliances and home appliances, digital-analog circuits are very common, and basically all electronic products are inseparable from digital circuits and analog circuits. The frequency of digital circuits is high, such as: digital logic such as data, address, and system. The signal sensitivity of analog circuits is high, such as: audio, sampling, reference power supply, etc. Analog signals are susceptible to interference from digital signals, and one of the main causes of interference is the ground wire. [0003] The traditional "single-point grounding of power supply" and "single-point grounding of output terminals"; due to the different circuit performance requirements and the structural differences of PCB (Printed Circuit Boa...

AI Technical Summary

Problems solved by technology

[0003] The traditional "single-point grounding of power supply" and "single-point grounding of output terminals"; due to the different circuit performance requirements and the structural differences of PCB (Printed Circuit Board, printed circuit board), the signal backflow is too long and the signal Incompleteness and other problems usually require repeated adjustment of the grounding point, wasting a lot of time and energy, and cannot fully solve the problem

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