inductor to be used at 2.4 ghz

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aashishsharma

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Hey I am designing some circuit which needs inductors.
My problem is my circuit is functioning at 2.4 ghz and i have not worked at such high freq.I found on internet that SRF might pose problem although i understood the concept but still in the dark regarding what inductors to use.
some inductors to be used in elliptical low pass filter and other in LNA
thnks in advance
 


hey i found 3.3nH here but i also need 1.2uh and 0.68uH too.
any ideas?
 

Are you sure that is a 2.4GHz filter? I think you need to show your design.

Keith
 


keith1200rs said:
OK, I don't think you will be expecting the IQ demodulator inductors to be working at 2.4GHz. Use the Digikey search tool with appropriate filters to narrow your search:



Keith.
Click to expand...

Do you mean its not possible to find the inductors to be working at that range???
 

I don't think you will find an inductor around 1uH with an SRF above 2.4GHz. These: are probably the highest ones I know of and they are not meant for filters - they are power inductors.

2.4GHz operation is not required for the IQ demodulator filter - the demodulator bandwidth is only 90MHz.

Keith
 

keith1200rs said:
2.4GHz operation is not required for the IQ demodulator filter - the demodulator bandwidth is only 90MHz.


Keith
Click to expand...

yeah I saw the bandwidth in the datasheet. Basically I have a 2.4 ghz LO frequency signal and other RF input signal that i will be feeding will be 2.4 + some frequency. So the mixer will be giving me a sum and a difference frequency. I am only interested in difference frequency that would be < 10 Khz { which means 2.4 +10 khz would be coming to RFIN}.
so i need to filtler out sum frequency.
I saw many other demods too but i am sure this is right one as it allows LO freq to be upto 2.7ghz
I COULD NOT UNDERSTAND EXACTLY THE MEANING OF DEMOD BANDWIDTH???
AASHISH
 

My understanding is that the demodulator will filter the higher frequency components (2.4GHz and higher) so you don't have to worry about them. Maybe someone else can give a better explanation.

Keith
 

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