Knowledge

PCB impedance board is an indispensable part of modern electronic manufacturing. It plays an important role in circuit wiring, signal integrity, power consumption control and EMI anti-interference. By controlling the impedance value and optimizing the circuit design, the signal transmission quality can be improved, power consumption can be reduced, and the reliability and anti-interference ability of the circuit can be improved.

1. Definition and basic principles of PCB impedance board

PCB (printed circuit board) impedance board refers to a printed circuit board that uses specific materials and technologies to achieve specific impedance values when designing and manufacturing electronic equipment. Impedance value refers to the resistance that current encounters when it travels in a circuit. PCB impedance boards achieve specific impedance values by controlling parameters such as line width, spacing, layer spacing, lead length, and ground holes between layers.

2. The use of circuit wiring

In high-frequency circuits, the signal transmission speed is very fast. To ensure the integrity of the signal, it is necessary to use an impedance matching circuit. The PCB impedance board can ensure that the signal transmission speed on the circuit board is consistent and avoid signal distortion and attenuation. At the same time, the impedance board can also reduce signal crosstalk and improve signal reliability.

3. The use of signal integrity

PCB impedance board can effectively reduce signal reflection and interference and improve signal integrity. In high-speed signal transmission, if the signal reflection amplitude is too large, it will cause signal distortion and increase power consumption. Impedance boards can reduce signal reflection and interference and improve signal transmission quality by controlling circuit wiring and adjusting circuit parameters.

4. The use of power consumption control

When the impedance matching of the circuit is not guaranteed, current will be reflected in the circuit, which will lead to energy loss and increase in power consumption. PCB impedance board can reduce signal reflection and interference, thereby reducing power consumption. In large-scale integrated circuits, power consumption control is very important, and the impedance board plays an important role in power consumption control.

5. The use of EMI anti-interference

Electromagnetic interference (EMI) is a serious problem in modern electronic equipment. The PCB impedance board can suppress signal radiation and interference and reduce the impact of electromagnetic waves on other electronic equipment. At the same time, the impedance board can also prevent external electromagnetic signals from entering the circuit and improve the anti-interference ability of the circuit.