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The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
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Old 28th June 2020, 10:35 PM   #2281
andrea_mori is offline andrea_mori  Italy
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Quote:
Originally Posted by clsidxxl View Post
Andrea what is the supply voltage required for New Driscoll and Differential XO.
A very clean supply from 12V up to 18V.
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Old 29th June 2020, 04:49 PM   #2282
WWWWW11 is offline WWWWW11  Japan
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Originally Posted by gentlevoice View Post
@andrea: ... thanks for outlining why the Pierce has re-entered your selection - I have to admit that I really do look forward to seeing what you have arrived at ...

One suggestion - and please don't see this as not recognising that you are already doing a lot and fine work - but have you considered to also include your "best solution" for a frequency divider? Unless your preferences have changed I remember your being very interested in R2R DACs and here I reckon that a splendid frequency divider may be helpful ...

@JohnW:



Hi John ... Might I ask you a question in relation to this? Using lower value resistors increase the effective bandwidth of the track transmission, however, unless the resistor's value leads to critical damping or over-damping of the track response, might the overshoot of the digital pulse (slight or more pronounced) not transfer back into the digital circuitry's power supplies and thus cause more general noise on the PSU line - and eventually potentially more phase noise in the digital transmission?

I reckon this may be what you imply with your 100 ohm suggestion but essentially where would you say that the "sweet spot" speed wise vs overall circuitry stability/noise is?

About terminology: You call the resistors "termination resistors" which pops up in my mind as "resistors close to where the digital transmission line ends". We may of course just use different words for the same resistor - but just to clarify - do you use both a sending resistor & a termination resistor? Don't know if this makes sense ...

BTW - and this is just meant to be very briefly off-topic - over time I have tried out & listened to some SMD resistors (e.g. TNPW-vishay, Susumu-RG, MMA0204, PFC-vishay) and to my ears these resistors SQ wise are not really close to the sound quality of the better "regular" resistors. Might you/others here have experience with a really good sounding SMD resistor?

Cheers,

Jesper
Hi, gentlevoice.
This page is useful for your question. (written in Japanese)
特性インピーダンスとドライバの駆動能力 - 半導体事業 - マクニカ
Google translated
Characteristic impedance and driver drivability
Damping resister is to match to transmission line impedance to prevent reflection.

BTW, I surprised LVDS clock deliverly.
LVDS included termination requirements in their specifications.
LVDS isolator (Analog Devices ADN465x) has much better sound quality than single-ended isolator (smaller jitter).
Molex TwinMax is very stable transmission wire (Skew: <10 ps/m).
I posted here.
SAR ADC for high performance audio ADC project [LTC2380-24]
LVDS reciver (FIN1002M5X etc) can convert LVDS to CMOS at near the DAC.
I surggest sine to LVDS converter.

Edit: Fix my post url and add mention of jitter.

Last edited by WWWWW11; 29th June 2020 at 05:17 PM.
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Old 30th June 2020, 04:56 AM   #2283
gentlevoice is offline gentlevoice  Denmark
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The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
Hi WWWWW11 ... Thanks for your feedback - I will check it out. But otherwise I would suggest to let this thread be open for the current TWTMC news.

Thanks again ;-)

Jesper
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Old 30th June 2020, 02:26 PM   #2284
laserscrape is online now laserscrape
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Do the clocks have a standby function like most standard XOs have?
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Old 30th June 2020, 02:42 PM   #2285
andrea_mori is offline andrea_mori  Italy
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Quote:
Originally Posted by laserscrape View Post
Do the clocks have a standby function like most standard XOs have?
All the oscillators don't have output enable funtion, the clock is always present at the SMA output connector.
They don't have any standby function, we suggest to keep the oscillators always power on.

Clock selection has to be implemented in the device that uses these oscillators.

Our announced FIFO system provides the selection using relays in "T" configuration, no multiplexer in the clock path.
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Old 30th June 2020, 04:09 PM   #2286
TNT is offline TNT  Sweden
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Your upcoming DAC project, would you say it's basically a theoretical approach or a "listening" approach?

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Old 30th June 2020, 04:15 PM   #2287
diyiggy is online now diyiggy
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What a drole question from a man that always defend to death Soekris DAC and ultra damped Hypex amp whatever the true sound they bring ? Financial interests TNT ? Are you really still listen to music or just interested by theories ?
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Old 30th June 2020, 04:21 PM   #2288
TNT is offline TNT  Sweden
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C'mon Eldhamn...

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Old 30th June 2020, 04:40 PM   #2289
andrea_mori is offline andrea_mori  Italy
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Quote:
Originally Posted by TNT View Post
Your upcoming DAC project, would you say it's basically a theoretical approach or a "listening" approach?

//
Neither and both, let call it "the SOTA approach".

I prefer a different classification, as an example about clock:
- low-fi approach: Si570
- midi-fi approach: Crystek
- hi-fi approach: older oscillators of this thread and similar commercial devices
- SOTA approach: new Driscoll and Differential oscillators
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Old 30th June 2020, 04:50 PM   #2290
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ahaha guys, that's a good one, you all have passed the dialectic IanCanada exam !
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