Pure sine wave generator, with less than -80 dB in distortion.

Hi..

I am in the need for a good  THD meter soon, so I am scooping the net for ideas, for a very pure sine generator, with less than 0,01% / -80dB in distortion.
I am of course gonna use a high-q bandpass filter.. any recommendations regarding opamps for that, or is TL07x or any low noise JFET opamp just fine?

Any rats in here with pointers for that / pdfs or old dusty bible books from eBay I should buy?

- Thanks in advance..

Funkaaai.... Slap!

http://www.ebay.com/itm/Ultra-low-distortion-0-00001-1kHz-sine-generator-assembled-and-tested-PCB-/321897169858?
http://www.diyaudio.com/forums/equipment-tools/205304-low-distortion-audio-range-oscillator-21.html
http://groupdiy.com/index.php?topic=48776
http://www.linear.com/docs/4134 page 28 and onwards

JD 'not affiliated' B.

-80 dB is pretty easy to do in the audio frequency range; any decent sound card/DAC should do, or an old audio analyzer (e.g. HP 339A).

Samuel

jdbakker said:

http://www.ebay.com/itm/Ultra-low-distortion-0-00001-1kHz-sine-generator-assembled-and-tested-PCB-/321897169858?
................

Click to expand...

Ahh.. I did use the search function, but that was exactly what I needed.
- Thank you so much!

Samuel Groner said:

-80 dB is pretty easy to do in the audio frequency range; any decent sound card/DAC should do, or an old audio analyzer (e.g. HP 339A).

Samuel

Click to expand...

Yeah I just tried to avoid being flamed with qeustions if I started out with -140 dB.  ;D

FunkySlap said:

jdbakker said:

http://www.ebay.com/itm/Ultra-low-distortion-0-00001-1kHz-sine-generator-assembled-and-tested-PCB-/321897169858?
................

Click to expand...

Ahh.. I did use the search function, but that was exactly what I needed.
- Thank you so much!

Samuel Groner said:

-80 dB is pretty easy to do in the audio frequency range; any decent sound card/DAC should do, or an old audio analyzer (e.g. HP 339A).

Samuel

Click to expand...

Yeah I just tried to avoid being flamed with qeustions if I started out with -140 dB.  ;D

Click to expand...

If you want -140dB Sam is your man...  ;D

JR

Any decent music player that does 16/44.1 should be able to do better than -80 dB from a file and it's  free.