What are the measures to cut off interference propagation paths in PCB design?

就某个水呀

What are the measures to cut off interference propagation paths in PCB design? [Copy link]

The interference source refers to the component, device or signal that generates interference; the propagation path refers to the path or medium through which the interference propagates from the interference source to the sensitive device.

In PCB design, what are the measures to cut off the interference propagation path?

1. Fully consider the impact of power supply on the MCU. If the power supply is well made, the anti-interference of the entire circuit is mostly solved. Many MCUs are very sensitive to power supply noise. It is necessary to add a filter circuit or voltage stabilizer to the MCU power supply to reduce the interference of power supply noise on the MCU.

2. If the I/O port of the microcontroller is used to control noisy devices such as motors, isolation should be added between the I/O port and the noise source.

3. Pay attention to the crystal oscillator wiring. The crystal oscillator and the microcontroller pins should be as close as possible, the clock area should be isolated with a ground wire, and the crystal oscillator shell should be grounded and fixed.

4. Reasonably partition the circuit board and keep interference sources (such as motors, relays) and sensitive components (such as microcontrollers) as far away as possible.

5. Use the ground wire to isolate the digital area from the analog area. The digital ground and the analog ground must be separated, and finally connected to the power ground at one point.

6. The ground wires of the microcontroller and high-power devices should be grounded separately to reduce mutual interference. High-power devices should be placed at the edge of the circuit board as much as possible.

7. Using anti-interference components such as magnetic beads, magnetic rings, power filters, and shielding covers in key places such as microcontroller I/O ports, power lines, and circuit board connecting lines can significantly improve the anti-interference performance of the circuit.

The above are the measures to cut off interference propagation paths in PCB design. Do you understand them all?

Jacktang

The ground wires of the microcontroller and high-power devices should be grounded separately. This is easier said than done.

annysky2012

It is important to cut off the source. Not only the PCB layout, but also the electrical layout

就某个水呀

annysky2012 posted on 2021-5-11 08:16 It is important to cut off the source. Not only the PCB layout, but also the electrical layout

Yeah, yes.