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Distortion analysis - a thought experiment
Distortion analysis - a thought experiment
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Old 13th August 2019, 02:00 PM   #61
diyralf is offline diyralf
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It is from AudioSience. I guess it is the analog oscillator. DAC are too bad :-)
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Old 13th August 2019, 02:40 PM   #62
jan.didden is offline jan.didden  Europe
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Analog generator. It says in the screen shot ;-)

Jan
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Old 13th August 2019, 02:52 PM   #63
phofman is offline phofman  Czech Republic
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I see, I did not zoom-in the diyralf's screenshot. I assume your screenshot is from an analog generator too. Please can you post also the digital generator, for comparison?
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Old 13th August 2019, 03:20 PM   #64
jan.didden is offline jan.didden  Europe
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Well if I could, I would have one of those babies, but alas! But I will ask.

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Old 15th August 2019, 07:56 PM   #65
DualTriode is offline DualTriode  United States
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Jan,

A couple of thoughts about testing your super duper stuff.

Test the noise performance without the test signal, with the input shorted. Send the output through a 100 times gain known quality instrument amplifier. (OPA1612?) That output goes into your System 2 analyzer. Is the super duper stuff worthy? If yes then next.

If you are looking for better than -134dB 2nd harmonic take the SDS down the road to you neighbors APx555 that is good for -150ish dB 2nd harmonic. If yes then stop, else.

Or split the generator output send half to your DUT the other half to the inverting input of an OPA1612. Sum the outputs of your DUT and the inverted instrument OPA1612, the test input signal fundamental and harmonics will null. What remains is only the DUT error output. Send the amplified error output to your System 2 analyzer. See Figure 34 in the OPA1612 data sheet. This is the stuff of error correction.

http://www.ti.com/lit/ds/symlink/opa1612.pdf

Or I could be full of it.

Thanks DT

New out of the box unbalanced APx555.
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Last edited by DualTriode; 15th August 2019 at 07:59 PM.
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Old 15th August 2019, 08:19 PM   #66
jackinnj is offline jackinnj  United States
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Distortion analysis - a thought experiment
Quote:
Originally Posted by DualTriode View Post
New out of the box unbalanced APx555.
is there a "jealous" emoji out there?
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Old 15th August 2019, 08:34 PM   #67
DualTriode is offline DualTriode  United States
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Jackinnj,

Funny thing. I was thinking of you the entire time I was typing stuff about noise measurement.
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