Impedance Control PCB-China PCB Manufacturer

Impedance control PCB manufacturer in Shenzhen, China, PATT CIRCUITS introduces what is impedance?

In circuits with resistance, inductance, and capacitance, the obstruction to alternating current is called impedance by Chinese PCB manufacturer China. The impedance is usually represented by Z, which is a complex number. The real part is called a resistor, and the imaginary part is called a reactance. The blocking effect of the capacitor on the alternating current in the circuit is called the capacitive reactance. The inductance acts on the alternating current in the control impedance PCB Printed Circuit Board. For inductive reactance, the blocking effect of capacitors and inductors on the AC in the control impedance PCB Printed Circuit Board is collectively called reactance. The unit of impedance is Europe.

Impedance type of control impedance PCB Printed Circuit Board

(1) Characteristic impedance of control impedance PCB Printed Circuit Board

In electronic information products such as computers and wireless communications, the energy transmitted in the circuit of the control impedance PCB Printed Circuit Board is a square wave signal (called pulse pulse) composed of voltage and time, and the resistance encountered is It is called characteristic impedance by control impedance PCB Printed Circuit Board manufacturer in China and other countries control impedance PCB Printed Circuit Board manufacturer.

(2) Differential impedance of control impedance PCB Printed Circuit Board

The driver inputs two identical signal waveforms of opposite polarity, which are respectively transmitted by two differential lines, and the two differential signals are subtracted at the receiving end. The differential impedance is the impedance between the two wires of control impedance PCB Printed Circuit Board.

(3) odd mode impedance of control impedance PCB Printed Circuit Board

The impedance of the two lines in the two lines is the same as the impedance of the two lines of control impedance PCB Printed Circuit Board.

(4) Even mode impedance of control impedance PCB Printed Circuit Board

The drive inputs two identical signal waveforms of the same polarity and the impedance of control impedance PCB Printed Circuit Board when the two wires are connected together, said control impedance PCB Printed Circuit Board manufacturer China.

(5) Common mode impedance of control impedance PCB Printed Circuit Board

The impedance of the two lines in the two lines is the same as the impedance of the two lines, and is usually larger than the odd mode impedance.

Why do PCB boards need to be impedance?

The PCB Circuit Board impedance refers to the resistance and the parameters of the reactance, which hinder the AC. Impedance processing is essential in the production of pcb boards. The reasons are as follows:

1. The control impedance PCB Printed Circuit Board line (the bottom of the board) should be considered for the installation of electronic components. After plugging, consider the conductive performance and signal transmission performance of control impedance PCB Printed Circuit Board assembly. Therefore, the lower the impedance of control impedance PCB Printed Circuit Board, the better the resistivity should be lower than 1/TImes per square centimeter; -6 or less, suggest control impedance PCB Printed Circuit Board manufacturer from China.

2, PCB circuit board in the production process to experience copper, electroplating tin (or electroless plating, or thermal spray tin), connector solder and other process manufacturing links, and the materials used by control impedance PCB Printed Circuit Board manufacturer China in these links must ensure the resistivity of the bottom, in order to ensure The overall impedance of control impedance PCB Printed Circuit Board is low to meet product quality requirements and can operate normally suggested control impedance PCB Printed Circuit Board manufacturer from China.

3. The tin plating of the PCB circuit board is the most prone to problems in the whole control impedance PCB Printed Circuit Board production in control impedance PCB Printed Circuit Board manufacturer factory, and is the key link affecting the impedance of control impedance PCB Printed Circuit Board. The biggest defect of the electroless tin plating layer is that it is easy to change color (both easy to oxidize or deliquesce), and the brazing property is poor, which may cause the circuit board to be difficult to solder PCB assembly, and the impedance is too high, resulting in poor electrical conductivity or instability of the whole control impedance PCB Printed Circuit Board performance said control impedance PCB Printed Circuit Board manufacturer from China.

4. There are various signal transmissions in the conductors of the control impedance PCB Printed Circuit Board. When the transmission rate is increased, the frequency must be increased from PCB manufacturer in China. If the line itself is different due to etching, laminate thickness, wire width, etc., the impedance value will change. The signal is distorted, resulting in a decline in the performance of the control impedance PCB Printed Circuit Board, so it is necessary to control the impedance value within a certain range by control impedance PCB Printed Circuit Board manufacturer from China.