Top 10 tips for high-frequency PCB design.
Are you looking for the top 10 tips for high-frequency PCB design? If yes, then continue reading the article.
High frequency PCBs have become a buzz word in the field of electronics and their demand has hit through the roof in the last few years. Many developers find it difficult or intriguing about the design of a high frequency PCB. However, after reading this article, all your doubts and confusions will be removed as I will discuss 10 key points that you ought to remember while designing a high frequency PCB.
What is a High-frequency PCB?
A PCB (Printed Circuit board) having a frequency range of 500 -2000 MHz is generally regarded as a high frequency PCB. They are a perfect choice for high-speed and complex electronic applications as they provide faster signal flow rates which is a prerequisite for modern multi-functioning devices.
After the basic introduction, let’s talk about the top 10 tips to create high-frequency design.
1: How to select quality of Material
If you wish to create PCB design with high frequency then you cannot compromise on the quality of material. In a PCB design, we go through different phases, and we need to be cautious during every manufacturing process by creating the perfect plan beforehand. First of all, we need to understand our requirements. The creator must know the required configuration of his circuit and then choose the best quality material matching his needs. Then he will be able to go with balanced material in terms of requirements, cost, and productivity. Most developers use FR-4 material, Flame Retardant type 4, for high frequency PCBs which is cost effective.
2: How to make Perfect plan for a perfect High-Frequency design
To create a perfect design, the developer ought to maintain the best plan in his mind. He should pragmatically develop a plan for every step and then write it to down. He ought to make visual diagram first with complete components. Proper research should be conducted to know how circuits interconnect and establish quick current returns. We should form our power supply plan in documents format and distribute it in our team so everyone can be well aware of their task. A clear strategy about sensitive signals at the onset will save our time and money down the road.
3: How can you arrange your board/floor with insightful segments?
The basic plan is to arrange your board with insightful sections as per the plan. You need to work out in-depth on how your board is to be designed. Remember, sub-circuits are very important in board design so we should pay maximum heed to the sub-circuits in the design. Similarly, make a plan for each segment of the board and analyze them separately.
4: How to neglect High-frequency interference?
The underlying notion for neglecting high-frequency interference is to decrease the electromagnetic ground of high-speed signals. These signals are named Crosstalk. You can also work on between high-speed signal and the analog signals you can easily grip on digital noise interference and the analog ground as well.
5: Copper Layering on ground and power supply:
It is important to focus on the distance between the copper and the signal line when applying copper close to the high-speed signal line because Copper will diminish the characteristic impedance of the circuit. Likewise, be mindful so as not to influence the characteristic impedance of its layer, for instance in the structure of a double strip line.
6: How to get maximum shielding benefits
High-frequency signals on your board release electromagnetic radiations and their journey is from source to sink. You will observe the interfering of signals with each other or nearby elements. So,
•Make sure to avoid any crosstalk between the signals and keep parallel and long signals.
•Maintain distance as much as possible if you consider routing signals exist on a separate layer.
•in case if routing signals are on different layers, rout them in right angles.
- 7: Resistance Between the differential receiving line pairs:
The matching resistance between the differential sets at the less than desirable end is typically included, and it ought to be equivalent to the estimation of the differential impedance. Like this, the signal quality will be better.
8: A Matching resistor could be added between the receiver differential line pairs
To improve the signal quality, you can add a matching resistor between the receiver differential line pairs and make you sure that its value is almost equal to the differential impedance value.
9: High Frequency De-interference:
Interference is generated due to magnetic field of high frequency signals termed as crosstalk. Hence, it is necessary to minimize this high frequency interference by introducing distance between high frequency signals and add shunt traces towards the analog signal of the design.
10: Final inspection to finish General routing guideline:
Say no to 90 degrees: you have to avoid always using 90-degree angles in your transit. it should bear in your mind that if you will place traces in the right angle it will lead to signal reflection.
Benefits of differential pairs: if both the signals in your differential pair have the same length and gap, it will lead to match turning in your PCB design.
Manage your transmission lines: make sure to get enough time to draw your transmission lines. You can use microstrips or strip-lines in this regard. Note that microstrip traces will provide reference plane separated by a dielectric.
To conclude, if you follow the above guidelines, you will be able to develop a good-quality high frequency PCB. With significant enhancement in technology and requirements of electronic devices, high frequency PCBs are a progression in the right direction and with some design considerations, and careful planning, developers can manufacture a PCB matching their needs and requirements.
I hope this guideline will help you design a high-frequency PCB. In addition, if you want to know more about the high frequency PCB, you can click here to view.
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