Laminated structure of printing circuit board and multi-laminate laminated structure

Abstract

A laminated structure for PCB is composed of ground layer, power supply layer, power supply layer and ground layer. Said two power supply layers between two grounding layers are positioned symmetrically at central position of whole PCB. A 12-layer PCB is composed of the 6th and the 7th power supply layers, the second, the 5th, the 8th and 11th ground layer, and the first, the third, the 4th, the 9th, the 10th and the 12th signal layers. The 14-layer and 16-layer PCBs are also disclosed.

Description

technical field [0001] The invention relates to a laminated structure layer of a printed circuit board and a corresponding laminated structure of twelve, fourteen and sixteen-layer printed circuit boards. Background technique [0002] With the rapid development of science and technology, the integration and complexity of chips are getting higher and higher. The design of printed circuit board PCB has the following characteristics: [0003] (1) The signal rate transmitted on the PCB is getting higher and higher, from the original several MHZ to dozens of MHZ, and even to the current several GHZ. [0004] (2) The types of the power supply on the PCB have also changed from the original few to more than ten kinds now, the voltage level on the PCB is getting lower and lower, and the power supply power is getting higher and higher. [0005] (3) The signal interconnection density on the PCB is also increasing. [0006] This puts forward higher requirements on the signal integrity...

AI Technical Summary

Problems solved by technology

However, due to this division, if the adjacent signal layer has a signal line that crosses the division, such as image 3 As shown, the return flow on the power layer cannot pass through this division slot, but can only bypass; after bypassing, the entire signal current loop is significantly increased, as shown in image 3 As shown, when the signal AB is reflowed on the power plane, due to the existence of the groove, the circuit reflowed on the power plane has to flow along the groove. For the signal CD, the circuit returned on the power plane also has to flow along the groove, which brings The following disadvantages:

[0013] 1. Increase the current loop area, increase the loop inductance, and make the output signal waveform easy to oscillate;

[0014] 2. Increase the radiation interference to the space and be easily affected by the space magnetic field;

[0017] For high-speed signal lines that require strict impedance control and are routed according to the stripline model, the stripline model will also be destroyed due to the slotting of the upper plane or the lower plane or the upper and lower planes, resulting in discontinuity of impedance and destroying the signal. integrity

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