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Help - Design a Network Analyzer

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johnseven

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RF people,

I am trying to design a Network Analyzer.

Questions :
What detectors?
Analog Devices log amps ?
What signal source?
Use DDS (direct digital synthesis) ?
Use oscilloscope for display?
or computer display?
Or provision for both?
Software ?

Thank you for ANY suggestions


johnseven
 

toonafishy

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I remember reading the article about the Hagtronics in QEX. It is a very clever setup and I think it is the way you should go.
 

johnseven

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bobcat1

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look at circuit caller 150 there is a full design up to 1 gh

look at circuit caller 150 there is a full design up to 1 ghz

bobi
 

FANT

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circuit caller ?

Bobcat1, can you explain me what is circuit caller ?

Thanks

Mandi
 

Circuit_seller

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hi

i hope my experience in designing a spectrum analayzer can help u

1.For detector u can use a digital filter with dsp and measuring its power after filter
2.For log amp u can use ad8307 that have 80dB dynamic range and DC-500MHz Bandwidth
3.For signal source u can use a DDS or Hybrid PLL-DDS frequency synthesyzer
4.And finally if u use computer for display u can interface with ur DSP from computer easily.

Bests
 

johnseven

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Technical help from members

Bobcat1, Gakusei and Circuit_Seller.

I'm reading and following your many links/suggestions.
Very useful, indeed.
The first quick'n dirty experiment "to get a feel" for the problems, using
Analog Devices's AD8302 works. Good chip with mag and phase detectors,
but with only 60 dB range.
I'll proceed.
Thanks again,

J7
 

Circuit_seller

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Hi johnseven

I read AD8302 datasheet, but i did not find anythings about its performance below 100MHz.
Do you have expriences in working with it below 100MHz? is it still have good performance?

Regards
 

johnseven

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Circuit_seller said:
Hi johnseven

I read AD8302 datasheet, but i did not find anythings about its performance below 100MHz.
Do you have expriences in working with it below 100MHz? is it still have good performance?

Regards
Soryy for the delay. I was traveling ...

Yes. It works well in those frequencies too. I tried it as low as 5 MHz and it performed as well as at 100MHz.
 

eltonjohn

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there is design at cypress using the PSOC chip .. it was an awarded design .
i got all the parts and never put it together .But is a nice design
 

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