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RE: In other words, signal quality matters greatly

Hi,

Apologies for the delay in posting that, I just had to get around to measuring this and to taking a picture...

Here is a picture of a 48KHz signal from a commercial USB->SPDIF converter which incorporates my design, the tube stage is fed directly from the FPGA output pin.



This picture is at a pretty extreme degree of zoom in, compared to most we see posted here. The whole picture covers around 1/3rd of a single period of a 3MHz signal (the base rate is 48KHz).

This trace is for the full system, that is USB-SPDIF converter, with tube stage, Canare "75R" RCA connectors (both ends) and 2m Cable. It tests the signal at the 75R terminated "far" end of the cable. I find this gives a far better representation of the actual performance than just testing the output.

Note that the loaded output voltage is just a touch over 0.8V Peak-Peak BTW.

Ciao T
Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

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  • RE: In other words, signal quality matters greatly - Thorsten 08:07:29 09/30/10 (0)
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