PCB Fabrication

How to carry out anti-interference design on printed circuit board

by:A-TECH      2021-03-27
How to carry out anti-jamming design on printed circuit board 1.  A series of resistors can be used to reduce the jump rate of the upper and lower edges of the control circuit. 2.  Try to make the potential around the clock signal circuit close to 0, circle the clock area with a ground wire, and the clock wire should be as short as possible. 3.  The I/O drive circuit is as close as possible to the edge of the printed circuit board. 4.  Do not leave the output terminal of the gate circuit that is not in use. The positive input terminal of the unused operational amplifier should be grounded, and the negative input terminal should be connected to the output terminal. 5.   Try to use a 45° fold line instead of a 90° fold line, wiring to reduce the external emission and coupling of high-frequency signals. 6.  The clock line perpendicular to the I/O line has less interference than the parallel to the I/O line. 6.  The pin of the component should be as short as possible. 8.   Do not run wires under the quartz crystal or under components that are particularly sensitive to noise. 9. Do not form a current loop around the weak signal circuit and the ground wire of the low-frequency circuit. 10. When necessary, add a ferrite high frequency choke to the line to separate the signal, noise, power, and ground. A via on the printed circuit board causes a capacitance of about 0.6pF; the packaging material of an integrated circuit itself causes a distributed capacitance of 2pF~10pF; a connector on a circuit board has a distributed inductance of 520μH; a dual in-line The 24-pin integrated circuit socket introduces 4μH~18μH distributed inductance.
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