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OPA637/627 THD Measurements?
OPA637/627 THD Measurements?
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Old 29th December 2003, 06:26 PM   #1
johnferrier is offline johnferrier  United States
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Default OPA637/627 THD Measurements?

Has anyone seen or have low level THD measurements for the OPA637/627?

The TI datasheet has measurements for +10/-10V (whatever that means for sure), but nothing at say 1Vrms. Douglas Self has graphs for 3Vrms.

Anyway I'd be interested in measurements 1Vrms and 0.1Vrms at 1khz and 10khz with a 600 or 1k ohm load.

I'm trying to decide whether to go discrete or not. I'm aware that the discrete circuit does well at lower signal levels, but have no idea what the OPA637/27 does at lower levels...

Thanks for any input or suggestions.

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Old 29th December 2003, 09:47 PM   #2
ojg is offline ojg
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At these low signal levels, noise will be dominate over distortion so it is important to select appropriate Rf, Rg and source resistors. The gain is also important, and the distortion will be different in inverting or non-inverting mode.
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Old 30th December 2003, 06:41 PM   #3
PMA is offline PMA  Europe
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OPA637/627 THD Measurements?
Default OPA627 THD measurement

I have done some OPA627 THD spectra measurements, please have a look at my web page.
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