Impedance control in high-speed digital PCB design

Impedance control is an indispensable aspect of all aspects related to PCB. All stages from design to implementation are necessary. For PCB designers and engineers, neglecting impedance control can be disastrous.

Understand the basic factors of impedance control

The connecting wires in the PCB perform multiple functions. In addition to current, they also participate in signal transmission lines. Multifunction helps to maximize the small size and digital output.

Preventing reflections of signal transmission in the PCB is essential. Impedance control, adjustment and matching impedance can reduce the transmission loss in the circuit. Impedance is a characteristic in AC circuits. It is the resistance provided by the resistance parallel circuit and the power plane for alternating current.

Various reasons will affect the characteristic impedance of the PCB design. The wrong transmission line can cause many errors.

The characteristic impedance may also change due to other reasons. Possible factors include:

1. Circuit trace thickness.

2. The dielectric value of the prepreg around the circuit trace.

3. The thickness of the insulator also plays a role.

As a professional China PCB manufacturer, A-tech has more than 15 years of rich experience in PCB manufacturing. Call us.