schiit yggdrasil LIM technical measurements

Discussion in 'Source Measurements' started by atomicbob, Sep 23, 2022.

  1. atomicbob

    atomicbob dScope Yoda

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    Examine gain linearity for Modi MB v1 (OG) which is a 16 bit DAC:
    01 20160812 Modi MB SE 1KHz gain linearity - USB annotated.png
    Observe how deviation begins at approximately -70 dBFS and maximum deviation is approximately -5 dBFS

    Gain linearity for Modi MB v2 which is still a 16 bit DAC:
    02 20221007 Modi MB v2 amplitude linearity FFT spdif SE t5 annotated.png
    Observe how deviation begins at approximately -90 dBFS and maximum deviation is approximately -2 dBFS

    Gain linearity for yggdrasil LIM which is also a 16 bit DAC:
    03 20220825 yggdrasil_LIM amplitude linearity FFT AES SE annotated.png
    Observe how deviation begins at approximately -110 dBFS and maximum deviation is approximately +2 dBFS

    Now compare Dynamic Range for the same three DACs

    Dynamic Range Modi MB v1 (OG)
    04 20160812 Modi MB SE dynamic range - USB.png

    Dynamic Range Modi MB v2
    05 20221007 Modi MB v2 dynamic range FFT spdif SE t3.png

    Dynamic Range yggdrasil LIM
    06 20220825 yggdrasil_LIM dynamic range FFT AES SE.png
    Observe the continued increase in Dynamic Range progressing from Modi MB v1 to v2 and again from Modi MB v2 to yggdrasil LIM.

    20221007 DAC ENOB comparison.png
    Dynamic range to ENOB.

    Typically a DAC performs at or below the design bit depth. Mod MB OG fit that paradigm. Schiit performed some fancy DSP to obtain MB v2 results ABOVE design bit depth. yggdrasil LIM pushes the limit of possibility even further.
     
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    Last edited: Oct 7, 2022
  2. Clemmaster

    Clemmaster Friend

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    I had no idea there was a Modi MB v2! What changed from the v1? The performance seems greatly improved!
     
  3. atomicbob

    atomicbob dScope Yoda

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  4. schiit

    schiit SchiitHead

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    Dave is...learning.

    Don't fear Dave.

    Dave is doing amazing things.

    (Dave is not one of our products, he is a person.)

    More to come....
     
  5. purr1n

    purr1n Desire for betterer is endless.

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    I want to do a print interview with Dave.
     
  6. purr1n

    purr1n Desire for betterer is endless.

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    Fancy math. V1 was straightforward without dithering. V2 firmware had dithering and other tricks to handle the 11111111 to 00000000 transition which had the most glitch because that's when we are flipping on/off the most mini hair-dryers at the same time. I think I know what was done, but I am not saying.

    @atomicbob: you are probably being coy. We both know bandwidth can be traded for bitdepth. This is how 8-bit 'scopes can do 12-bits or 16-bits. All in fancy math and dithering. Math is fun.

    Anyway, point is that measurements are just that. Fancy math can change measurements without any underlying change in the hardware.
     
  7. exocer

    exocer Acquaintance

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    Thank you for the epic explanation.
     

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