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(1) Reasonable layout of wires
The printed circuit should be away from the interference source and can not cut the magnetic lines; avoid parallel routing, double panels can cross through, single panel can be crossed by "flying line"; avoid looping, prevent loop antenna effect; clock signal wiring should be ground The line is close. The wiring for the data bus should be placed between each of the two wires or next to the address leads. In order to suppress the reflection interference at the end of the printed wire, the ground and power terminals can be connected at the end of the transmission line. Each of them is connected with a matching resistor of the same resistance.
(2) Adopting shielding measures
Large area shielded ground wire and special shielded wire can be set to shield weak signals from interference.
(3) Decoupling capacitor configuration
In a DC power supply circuit, changes in the load can cause power supply noise and interfere with the circuit through the power supply and wiring. In order to suppress this interference, a 10 to 100 taF electrolytic capacitor can be connected to the power supply terminal of the unit circuit; a 680pF-0.1uF ceramic capacitor or 4-10 chips can be arranged at the power supply end of the integrated circuit to configure a 1 to 10 The electrolytic capacitor of the heart; for the ROM, RAM and other chips should be directly connected to the decoupling capacitor between the power line (Vcc) and the ground ((GND).
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Printed Circuit Boards
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