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