China Wholesale Pcb Prototype Services Factories - 6 Layer ENIG Impedance Control PCB – Huihe
China Wholesale Pcb Prototype Services Factories - 6 Layer ENIG Impedance Control PCB – Huihe Detail:
Impedance Characteristics Of PCB
According to the signal transmission theory, the signal is a function of time and distance variables, so every part of the signal on the line may change. Therefore, the AC impedance of the transmission line, that is, the ratio of voltage change to current change, is determined as the characteristic impedance of the transmission line.
The characteristic impedance of the transmission line is only related to the characteristics of the signal connection itself. In the actual circuit, the resistance value of the wire itself is less than the distributed impedance of the system, especially in the high frequency circuit, the characteristic impedance mainly depends on the distributed impedance caused by the unit distributed capacitance and unit distributed inductance of the wire.
The characteristic impedance of an ideal transmission line only depends on the unit distributed capacitance and unit distributed inductance.
Common Impedance Types
Characteristic impedance
In computer, wireless communication and other electronic information products, the energy transmitted in PCB circuit is a square wave signal (called pulse) composed of voltage and time, and the resistance it encounters is called characteristic impedance.
Differential impedance
Two identical signal waveforms with opposite polarity are input at the driving end and transmitted by two differential lines respectively, and the two differential signals are subtracted at the receiving end. The differential impedance is the impedance zdiff between two lines.
Odd mode impedance
The impedance Zo of one of the two lines to the ground is the same.
Even mode impedance
The impedance zcom of two same signal waveforms with the same polarity input at the drive end when the two wires are connected together.
Common mode impedance
The impedance Zoe of one of the two lines to the ground is the same, which is usually larger than the odd mode impedance.
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Being supported by an state-of-the-art and skilled IT team, we could supply technical support on pre-sales & after-sales service for China Wholesale Pcb Prototype Services Factories - 6 Layer ENIG Impedance Control PCB – Huihe , The product will supply to all over the world, such as: Bolivia, Stuttgart, Singapore, Based on our automatic production line, steady material purchase channel and quick subcontract systems have been built in mainland China to meet customer's wider and higher requirement in recent years. We are looking forward to cooperating with more clients worldwide for common development and mutual benefit!Your trust and approval are the best reward for our efforts. Keeping honest, innovative and efficient, we sincerely expect that we can be business partners to create our brilliant future!
By Heloise from Ecuador - 2018.02.04 14:13
This company has the idea of "better quality, lower processing costs, prices are more reasonable", so they have competitive product quality and price, that's the main reason we chose to cooperate.
By Michelle from Armenia - 2017.06.25 12:48
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