LMX2595: Frequency doubling occurred on the spectrometer

Yiquan

Other Parts Discussed in Thread: LMX2595

Hello,

when I used LMX2595 for spectrum analyzer (range 1-3GHz) analysis, I found that frequency doubling occurred in the spectrum below 1.5GHz, which was caused by nonlinear components (diodes) on the circuit board?
thank you.

over 1 year ago

0 Yiquan over 1 year ago

Prodigy 50 points

0 vicente flores prado over 1 year ago in reply to Yiquan

TI__Mastermind 28982 points

Hi Yiquan,
Are you saying that for frequencies below 1.5 GHz your output frequency is actually twice the RFout you entered in the GUI?

Regards,

Vicente

0 Yiquan over 1 year ago in reply to vicente flores prado

Prodigy 50 points

I mean frequency doubling, like I set 1.3GHz, but both 1.3GHz and 2.6GHz on the spectrum

0 vicente flores prado over 1 year ago in reply to Yiquan

TI__Mastermind 28982 points

Hi Yiquan,
It is possible you have spurs due to you frequency configuration.

Could you please share your config?

Regards,

Vicente

0 Yiquan over 1 year ago in reply to vicente flores prado

Prodigy 50 points

0 vicente flores prado over 1 year ago in reply to Yiquan

TI__Mastermind 28982 points

Hi Yiquan,
Yes,
If the carrier is 1.3GHz (RFout) then you can expect seeing to see 2.6GHz & 3.9 GHz on the spectrum analyzer given these are the second and third harmonic respectively.

Regards,

Vicente

RF & microwave

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LMX2595: Frequency doubling occurred on the spectrometer