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A spectrum analyzer for measuring linearity
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xzswq21:
Hello
I have designed a new sensor in 2018 so I need to have a spectrum analyzer to measure the harmonics and noise of the sensor. Unfortunately I haven't accessed to a Spectrum Analyzer yet!

I analyzed all circuits in theory and then simulated and built the sensors. In simulation the SFDR is from 70dBc to 90dBc. the results are very good for my application. For example if the input signal is 0dB the second harmonic distortion is 80dB or 85dB or something similar (it depends on the frequency). One of my sensors covers from 10KHz to 50MHz but another sensor can cover from 10KHz to 100MHz and all the outputs are 50 Ohm, 1Vp-p and the SNR is from 75 to <87 (it depends on the bandwidth). now I want to measure the HD2, HD3, THD, AC response (magnitude of the bode plot) of my sensors.

I apply 10KHz to my sensor and check the output response to measure HD2 (second harmonic distortion), HD3 (third harmonic distortion), THD then I will increase the input frequency upto 100MHz step by step (for example 100KHz, 200KHz, 300KHz,...., 1MHz,...) to plot HD2, HD3, THD over frequency axis, another test is only to plot magnitude of the bode plot of the sensors, this is all of I want :) finally I will publish the results in a journal.

I see most of good spectrum analyzers have Amplitude accuracy better than 1dB and it's very good for me, 90dBc/Hz of phase noise is very good, which spectrum is good for me? Old HP8560a, HP856x, E440x series or etc?
Plus I've found HP3588a dynamic signal analyzer as an interesting choice but it's boatanchor!!:
https://accusrc.com/uploads/datasheets/4629_3588A.pdf

Thanks
SilverSolder:

What is your budget for this?
xzswq21:
I have taken some screenshots from the datasheets, please help me to choose a proper spectrum analyzer for my application, (you may know better models):

For HP8560E:




For HP8560a:




For HP3588a Dynamic signal analyzer:


plus HP3588a has "low distortion mode"
https://accusrc.com/uploads/datasheets/4629_3588A.pdf
The phase noise of HP3588a is only -105dBc/Hz @1KHz

For Siglent SSA3000 series:


Phase Noise Performance of HP Spectrum analyzers:
xzswq21:

--- Quote from: SilverSolder on March 26, 2021, 09:22:10 pm ---
What is your budget for this?

--- End quote ---
Do you have any solutions?! :)
SilverSolder:

If money is no object, www.keysight.com is your friend!  :D
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