High Frequency Circuit Printed Circuit Board Design Guidelines

High frequency PCB boards are often used in high frequency applications, and ground and power lines have a very important impact on high frequency applications. For example, the spike current, it shuttles in the high-frequency components, from the power line out of the current, through the board and through the ground line feedback to ground, if the DC power supply voltage can not be maintained at a stable value, then it will have a great impact on the performance of the circuit. Therefore, the high frequency circuit board design guidelines, the power line should be as short as possible. Today, let TOPFAST share some design methods for printed circuit boards for high frequency circuits.

What will incorrect design will result in?

Incorrect design will not only lead to assembly quality decline, but also cause placement difficulties, frequent stop, affect the normal operation of automated production equipment, affect the placement efficiency, increase the rate of rework, directly affect product quality, yield and processing costs, serious when it will also cause printed circuit board scrap and other quality accidents. Moreover, the quality of the PCB design is difficult or even impossible to solve in the production process again, if neglected to control the quality of the design, in mass production will bring a lot of trouble, will cause components, materials, work time waste, and even cause significant losses.

The following are very useful guidelines when designing printed circuit boards for high frequency circuits:

1) Use a piece of ground or a large ground surface as the ground;

2) Use wide power lines;

3 ) ground and power lines should be very close to each other, and parallel;

4) Place a de-energizing capacitor between the ground and the power supply;

5) In high-speed pulse systems, the wire should be as short as possible because the skin effect and dielectric loss will increase proportionally with the wire length;

6) For large-size printed circuit boards, dielectric loss is particularly important. Therefore, the use of printed circuit boards to pay attention to whether there is a suitable high frequency range;

7) Determine which parasitic components (capacitance and inductance) is more harmful, and wiring based on this;

8) Keep all mismatched lines as short as possible, otherwise the rise time will increase to 1ns/cm;

9) When the parasitic capacitance may make the circuit performance worse, provide a ground connection for it (directly to ground or through a capacitor ground).

If you have any questions related to PCB boards or have a purchase request, you are welcome to contact TOPFAST to get help at any time.