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to measure nanohenry inductors - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

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 Post subject: to measure nanohenry inductors
Posted: Wed Apr 02, 2008 6:15 am 

Joined: Wed Apr 02, 2008 5:55 am
Posts: 1
Location: pune,india

I have designed LNA for 1420MHz by tunning microstrip lengths and inductors in GENESYS.

These inductors are in nanohenry(values are:16,24,390,58) and made by wounding copper wire on former.

Can u suggest me a practical method to measure these inducors since i don't have any LCR or Qmeter in nanohenry range.It's really urgent.

Thanking you,


 Post subject:
Posted: Mon Apr 14, 2008 11:11 am 
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 304
Location: London UK
There are ways.
Do you have a signal generator, and maybe a scanning receiver covering VHF?
If you can arrange to create a series tuned circuit using accurate close % tolerance capacitors, then if you feed the generator into the series circuit across the series-connected L and C, a receiver connected across the circuit will produce a minimum signal as it is almost a short circuit across the 50 ohms.
Since you know the C value accurately and the L value approximately, this narrows the search range down to a few MHz on the receiver. Then when you know F very precisely, you can correct the L value using the well-known resonance formula.
Hope that helps.

 Post subject:
Posted: Wed May 14, 2008 3:08 pm 
Yes, a series LC circuit will provide you an easy way to meas the L. Just be careful to have a well known C (with low tolerance), place the L an the C as close as you can to each other, and be sure to place them into a line with the correct characteristic impedance.
And if you want to be more accurate, once you have a first approach to the L value, reselect the C in order to have the resonance infrequency around the frequency you will be using the L (1420MHz), remember that L value also is function of the frequency.

Good luck! (www.viewrd.com.ar)

Posted  11/12/2012

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