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FvM said:I think, the inductance can't be determined without defining the respective return path.
aho911 said:Thanks for all your response.
What is the self-resonant freqeucny (SFR) for general 0402 zero ohm resistor jumper?
Is it still around 0.2nH on 2~5GHz?
Unfortunately, the piece of wire would show different inductances with each different distance to the ground plane.It's a partial inductance, similar to a piece of wire.
FvM said:Unfortunately, the piece of wire would show different inductances with each different distance to the ground plane.It's a partial inductance, similar to a piece of wire.
With 0402 chip, depending on where you define your reference planes, the pads may have a higher inductance than the chip itself. A meaningful analysis and measurement could be like this: Have e. g. a 8 mil trace on a 4 layer board, it has an inductance of about 0.5 nH/mm with a ground plane below. How does the inductance of a connection change, if you cut the trace and place a 0402 Jumper? In this case, the jumper may have virtually zero or even negative inductance, cause the overall inductance is reduced by the rather wide pads and jumper compared to the wire.
P.S.: Another realistic setup is a 20 mils/0.5 mm trace as reference. In this case, the said 0.1 nH are a good estimation for regular wrap around mount of the jumper. The inductance can be assumed effectively zero for a reversed flip-chip mount.