Frequency response of 0 ohm resistor on 50-ohm line?

Carlos Lopez4

Other Parts Discussed in Thread: CC1310

Hi:

Application Note AN098 (Layout Review Techniques for Low Power RF Designs) recommends using a 0-ohm resistors in series for un-mounted components in a pi filter for antenna matching.

Some 0-ohm resistors have a very poor frequency response. My design operates on the 433 MHz UHF band. What resistor/jumper technology would be the best for this type of jumper? I'm considering solid copper strips and metal based sensing resistors (at around 1-5 miliohm).

Thanks.

over 7 years ago

0 TER over 7 years ago

TI__Guru**** 317180 points

We have never seen this as an issue. A 0 ohm resistor contribute about 0.3 nH. We use resistors from Vishay at the moment.

In other words I don't see any reason for using something different from a 0 ohm resistor.

0 Carlos Lopez4 over 7 years ago in reply to TER

Prodigy 30 points

Thanks. Would you mind sharing the series of Vishay resistors? I've considered WSL series (WSL060300000ZEA9), which are solid copper strips (as opposed to thick or thin film) but I can't find in stock anywhere. Maybe the PZHT (thin film) or the RCWP (thick film) would do it?
I'm also considering metal-foil from other manufacturers.

0 TER over 7 years ago in reply to Carlos Lopez4

TI__Guru**** 317180 points

I don't have them in front of me but most of our reference designs uses a 0 ohm resistor. Check the CC1310 reference designs and the BOM excel file for details.

0 Carlos Lopez4 over 7 years ago in reply to TER

Prodigy 30 points

Thanks! That will be very helpful.

RF & microwave

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Frequency response of 0 ohm resistor on 50-ohm line?