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Reducing noise and electromagnetic interference in PCB design

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Several tips to reduce noise and EMI in PCB design:

(1) can be used at low speed chip without high-speed, high-speed chip used in key places.

(2) the method of a series of resistors can be used to reduce the speed of the control circuit up and down.

(3) as far as possible to provide some form of damping relay.

(4) using the minimum frequency clock to meet the system requirements.

(5) the clock generator as near as possible to use the clock device. Quartz crystal oscillator shell to be grounded.

(6) use the ground wire to turn the clock area, and the clock line is as short as possible.

(7) I/O drive circuit as near as possible to the edge of the printing plate, so as to leave the printing plate as soon as possible. Signal to enter the printed board to be filtered, the signal from the high noise area

Also want to add filter, at the same time with the end of a series of resistance measures to reduce the signal reflection.

(8) MCD useless end to be connected to high, or grounding, or defined as the output, the power supply to the ground should be connected to the ground, do not hang.

(9) the gate circuit input end do not idle vacant, unused amplifier positive input grounding, negative input connected with the output terminal.

(10) printed board as far as possible, use the 45 line instead of 90 line wiring to reduce the high frequency signal external transmission and coupling.

(11) according to the frequency and current switching characteristics of the printed circuit boards, noise components and non noise components to be farther away.

(12) single and double side panels with single point and single point grounding, power supply line, the ground as far as possible, the economy is able to withstand the words with a multilayer board to reduce power,

Inductance of ground.

(13) clock, bus, chip select signal to stay away from the I/O line and connector.

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