Characteristic impedance: In the Custom 4 layers flex circuit board industry, the ‘impedance control’ is generally blurted out but it’s not strictly correct. The professional term should be “Characteristic Impedance Control”. Because the “things” that “circulate” in computer PCB circuits are not currents, but are aimed at the transmission of square wave signals or pulses in energy. The “resistance” encountered during transmission of this “signal” is also called “characteristic impedance”, and its symbol is Zo. Calculation formula: In the electronic mechanical transmission signal line, the resistance encountered during the propagation of the high-frequency signal or electromagnetic wave is called the “characteristic impedance” (the combined effect of electrical impedance, capacitive reactance, and inductive reactance). It is used to evaluate the uniformity of the circuit and the uniformity of the thickness of the dielectric layer. The relationship with inductance and capacitance is:
In the formula, L is the inductance value and C is the capacitance value. However, the unit of Zo is still “ohm”. It can be seen that the commonly called “impedance control” is actually not a “control” for the “impedance” of alternating current.
Impedance Control (Impedance Control): Refers to the “resistance” that a certain circuit layer (Signal Layer) generates to its related layer (Reference Plane usually refers to the closest ground layer) under a high-frequency signal during transmission. It must be controlled within a rated range to ensure that the signal is not distorted during transmission.
In the formula, L is the inductance value and C is the capacitance value. However, the unit of Zo is still “ohm”. It can be seen that the commonly called “impedance control” is actually not a “control” for the “impedance” of alternating current.
Impedance Control (Impedance Control): Refers to the “resistance” that a certain circuit layer (Signal Layer) generates to its related layer (Reference Plane usually refers to the closest ground layer) under a high-frequency signal during transmission. It must be controlled within a rated range to ensure that the signal is not distorted during transmission.
Please refer the below pic shows:
No comments:
Post a Comment