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Old 4th December 2012, 02:35 AM   #1611
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Originally Posted by Fridrik View Post
Very powerfull scope indeed : wife can see that her husband is working late night on special project ;-) Nov 29 22:14.


What model&Brand?
Thanks Fridrik, not only powerfull, but also telling secret.

It's a LeCroy digital osc with 1GHz bandwidth and 8GHz sample rate.

Ian
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Old 4th December 2012, 02:29 PM   #1612
qusp is offline qusp  Australia
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Ian, is it just me, or does the inverted MCLK show more ringing than normal phase? is this ringing from your probe not being properly terminated or is this potato logic the unterminated driver you mentioned you would place?

secret? hmmm what secret?
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Old 4th December 2012, 02:53 PM   #1613
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but I have to say with the inverted MCK if we visualize without the ringing, which we can presume is an artifact or the termination of the probe; the wave does look cleaner. in normal MCLK the down stroke looks a bit different to the upstroke, with the inverted MCK it seems to exhibit a more similar shape on the up and down.
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Old 4th December 2012, 03:15 PM   #1614
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Originally Posted by iancanada View Post
Based on my testing result, I think I have to include this normal/inverted MCLK feature into Si570 clock board V3.0 design. But my question is which one is better to be as the default configuration.
It would be very nice if you could show us noise floor profiles observed in frequency spectra of DAC output for sine wave input signals.
Can you observe any significant differences in the profiles?
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Old 4th December 2012, 11:56 PM   #1615
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It would be very nice if you could show us noise floor profiles observed in frequency spectra of DAC output for sine wave input signals.
Can you observe any significant differences in the profiles?
I hope I had a AP.

Ian
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Old 5th December 2012, 12:10 AM   #1616
AR2 is online now AR2  United States
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Originally Posted by iancanada View Post
I hope I had a AP.

Ian
You see, and guys with AP will say I wish I have LeCroy, hahaha.
Does your scope has FFT feature? It might be manual process, but with good signal generator, you might be able to record and than read various Fqs.
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Old 5th December 2012, 12:13 AM   #1617
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I fear the problem he'll encounter is the depth of the noise floor =)
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Old 5th December 2012, 12:18 AM   #1618
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I'm still waiting for qusp to buy an AP so I can borrow it
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Old 5th December 2012, 12:24 AM   #1619
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Originally Posted by hochopeper View Post
I'm still waiting for qusp to buy an AP so I can borrow it
Me too .

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Old 5th December 2012, 12:31 AM   #1620
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You see, and guys with AP will say I wish I have LeCroy, hahaha.
Does your scope has FFT feature? It might be manual process, but with good signal generator, you might be able to record and than read various Fqs.
I hope LeCroy can do what AP dose, FFT is built in. But it optimized to high speed waveform and RF signals. Audio signal might be the most difficult signal to measure. Agree with qusp, it's the noise floor. But I'm just wondering if a really nice usb sound care with a really nice low jitter ADC clock and suitable isolator could become a half AP?

Ian
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Last edited by iancanada; 5th December 2012 at 12:39 AM.
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