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to measure nanohenry inductors - RF Cafe Forums

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

Joined: Wed Apr 02, 2008 5:55 am

Posts: 1

Location: pune,india

Hi!!

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,

shari


 
   
 
nubbage
 Post subject:
Posted: Mon Apr 14, 2008 11:11 am 
 
General
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.


 
   
 
FSomma
 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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