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Introduction to PCB layout design
Source: | Author:Anonymous | Published time: 2025-07-17 | 73 Views | 🔊 Click to read aloud ❚❚ ▶ | Share:
The increasing density of printed circuit boards (PCBs) makes PCB layout crucial for design as it impacts interference resistance. Special component layout requirements include keeping high - frequency component wiring short, increasing distance between components with high potential differences, thermistors away from heating elements, placing dismantling capacitors near chip power pins, positioning adjustable components for easy adjustment, and reserving positioning holes and bracket positions. Ordinary component layout requirements are to place components of each functional circuit unit according to circuit flow, arrange them uniformly around core components, consider component interference in high - frequency circuits and usually arrange components in parallel, and maintain a distance of at least 80mil between the PCB outline and the board edge with a rectangular board shape having an aspect ratio of 3:2 or 4:3.

The density of printed circuit boards (PCBs) is increasing, and the quality of PCB design has a significant impact on its ability to resist interference. Therefore, the layout of PCBs plays a very important role in design. Layout requirements for special components:

1. The shorter the wiring between high-frequency components, the better to minimize electromagnetic interference between them; Components that are susceptible to interference should not be too close together; Input and output components should be kept as far away as possible;

2. Some components have a high potential difference, and the distance between them should be increased to reduce common mode radiation. Special attention should be paid to the rationality of the layout of components with high voltage;

3. Thermistors should be kept away from heating elements;

4. The dismantling capacitor should be located near the power pin of the chip;

5. The layout of adjustable components such as potentiometers, adjustable inductance coils, variable capacitors, and micro switches should be placed in positions that are easy to adjust as required;

6. The positioning holes for the printed circuit board and the positions occupied by the fixed brackets should be reserved.

Layout requirements for ordinary components:

1. Place the components of each functional circuit unit according to the circuit flow, so that the direction of signal flow is as consistent as possible;

2. Centered around the core components of each functional circuit, the layout should be arranged uniformly and neatly on the PCB, minimizing and shortening the leads and connections between each component;

3. For circuits operating at high frequencies, interference between components should be considered. Generally, circuits should arrange components in parallel as much as possible to facilitate wiring;

4. The distance between the PCB outline and the edge of the circuit board is generally not less than 80mil. The optimal shape for the circuit board is rectangular, with an aspect ratio of 3:2 or 4:30.