PCB Circuit Board Reverse Engineering Distributed Decoupling Capacitors

In the process of PCB Circuit Board Gerber File Reverse Engineering, Since the .01uf capacitors had a limited effective frequency range, a 10 pf capacitor was placed in parallel with the original .01uf capacitors to determine the improvement at high frequencies.

For this set of experiments, the test over the PCB Circuit Board was populated with .01 uf and 10 pF capacitors. The 10 pF capacitors were placed in piggy-back fashion on top of the .01 uF capacitors. This resulted in a low-as-possible inductance between the two different values of capacitor.

This set of experiments was again repeated for a number of different port-to-port combinations after getting the PCB card Reverse Engineering, and with a number of different configurations with varying amounts of capacitor combinations. Table 2 shows the index of test result figures to port-to-port configurations.

The results show that at low frequencies of PCB board manufacturing, the S21 behavior is very similar to the case with only .01 uF capacitors. However, in the frequency range of 1000 to 1200 MHz, the increasing number of 10 pF capacitors had a significant effect and lowered the S21 parameter as more capacitors were added onto PCB Board side road. There seemed to be little improvement after 33 capacitors were added, indicating that all 99 positions were not necessary.

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