PWB Clone Over Grounding Line Noise

Grounding Line Noise is a commonly issue when design PCB board schematic diagram, PWB Clone will inevitably encounter the noise issue from power supply line, when the emergence of electro-magnetic interference on the digital circuit, the main reason is on the power supply line and grounding line, use oscillograph to monitor the obvious noise voltage.

Although there are a lot of people can assure that these noises is the main cause for electro-magnetic interference when PWB clone, but normally has no effective measures to deal with them, in order to achieve the purpose of noise elimination, it is necessary to understand the generating source of these noises:

Noise on the grounding line, when the occurrence of peak current from the power supply line, there is also some current flow through the grounding line, especially when the output electrical level turns from high to low for Clone Signal Amplifier PCBA, and the peak current from the ground line could be higher.

Due to the different conductance value on the grounding line which can also generate the voltage, and cause the grounding noise. The noise on the grounding line and power supply line can not only make the operation efficiency of circuit lower, but also generate stronger electro-magnetic radiation.

ICC means current on the power supply: when in the different output status, the radiation range is different. When the status is steady, so as the current will be steady. When the output switch from low to high status, and transient short circuit for increasing current, meanwhile the parasite capacitance will be charged for larger current; when output voltage switch from high to low for PWB clone, transient short circuit happen to increase the current, it will not charge the capacitance, so the current output will switch from low to high electrical level.

.VCC voltage on the power supply: when the ICC happens to mute, the conductance on the power supply line will generate conductive voltage;

Grounding line current, when output from the power supply and parasite capacitance charge to form the current with steady output and steady current.

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