PCB Board Reverse Engineering Side Road
Decoupling PCB Board Reverse Engineering Side Road
Side road means transfer the unwanted common mode Radio frequency energy, the main function of side road capacitor is generate a AC component and eliminate the unnecessary energy which has entered the sensible area, decoupling means elimination of radio frequency which get access to the distribution network when switch the component. The major task of decoupling capacitor is provide a partial DC power supply to component and decrease the transmission on the switch noise and guide the noise onto ground.
Selection of capacitor
When choosing the side road and decoupling capacitor, the value of capacitor can be chosen according to the frequency and capacitance, self-resonance frequency of capacitance calculated by logic series and the time clock speed.
The SMT components should be given priority especially for those footprint with relative lower lead inductance instead of through hole components. Furthermore, PCB board reverse engineering engineer will usually choose parallel decoupling capacitor to provide more working band and decrease the imbalance grounding.
Parallel capacitor system, if the working frequency higher than self resonance frequency, big capacitor will express the inductive impedance features and rise according to the increasing frequency; but the small capacitor will decrease the inductive capacitance accompany with increasing frequency.
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