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Blog / How to Caculate PCB Trace-to-Plane Capacitance

How to Caculate PCB Trace-to-Plane Capacitance

Posted:05:09 PM August 20, 2021 writer: tom

For instance, if the capacitance formula is put on the complying with a trace:

  • 4 Layer board signal routing alongside ground airplane
  • Board layer density: 0.188 mm
  • Trace Size: 0.75 mm
  • Trace Size: 7.5 mm

PCB trace
A normal worth for Emergency Room of FRC4 PCB product is 4.5. Because of the variants of product where an FRC4 board can be produced, this worth is not assured, however, must remain in the series of 4 to 5. The capacitance in between these traces would certainly be 1.1 pF. Certainly, the antenna result on a 7.5-mm trace would certainly be ruined, so this instance is a little bit severe. Overlooking the antenna impacts in the meantime, there are instances in which also a really tiny parasitical capacitance like 1 pF is undesirable. It significantly shows the result of 1 pF capacitance taking place at the inverting input of the op-amp. It triggers an increase of the outcome amplitude near the transmission capacity limitation of the op-amp. This is an invite to oscillation, particularly because the trace is a reliable antenna over 180 MHz.

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Tag: PCB Trace-to-Plane pcb trace capacitance
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