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Old 24th August 2012, 01:02 AM   #31
Tenson is offline Tenson  United Kingdom
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Dragging up an extremely old thread; is it worthwhile using NP0 type caps for bypassing op-amp supply rails, as opposed to more common ceramic caps like X7R? Is the difference only really shown in the audio signal path?
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Old 24th August 2012, 01:05 AM   #32
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I'd bypass them. The better ceramics clean up supply rail fluctuations better.
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Old 24th August 2012, 11:43 AM   #33
AndrewT is offline AndrewT  Scotland
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the x7r are probably working just fine.

I can't see what advantage an NP0 could bring in local decoupling.
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Old 24th August 2012, 11:52 AM   #34
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My understanding is that X7R caps are "lossy" and NP0 are not. The lossy quality of the X7R is what makes it good at suppressing noise.
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Old 24th August 2012, 12:24 PM   #35
DF96 is online now DF96  England
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Yes, that is my understanding too. The slight RF lossiness of the bigger ceramic caps means that parasitic impedances and resonances in PCB traces are not merely retuned (as an NP0 would do) but damped away. As always, use the appropriate cap for the job and ignore myths and fashions about 'good' and 'bad' audio caps.
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Old 24th August 2012, 01:10 PM   #36
Tenson is offline Tenson  United Kingdom
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Thanks for the replies!
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Old 18th April 2016, 02:26 PM   #37
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Quote:
Originally Posted by AndrewT View Post
Thanks Mzzj,

What is C0G?

Andrew

Check this out...

https://www.element14.com/community/...ullThread=true
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Old 22nd November 2016, 11:32 AM   #38
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RCE5C1H103J1M1H03A | Murata 10nF Multilayer Ceramic Capacitor (MLCC) 50 V dc 5% COG dielectric RCE max op. temp. +125C | Murata

This is a low price high value COG. Just bought 10 ( About 3 ), 10.18, 10.09,10.00,10.10,9.91,10.03,10.03,10.07,9.74,10.1 7 nF. measured to +/-0.5%. A good tight spec considering the 5% quoted. These would serve well for many uses. One day I shall try them as a RIAA preamp. NE5532 or better as the active part.
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Old 1st December 2016, 08:21 PM   #39
marce is offline marce  United Kingdom
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The losses in X7R caps when use for decoupling help in reducing the resonance peaks when different values are used on a supply rail for decoupling this is a requirement for good power delivery system integrity, less lossy caps cause more peaks and lead to an inferior supply. Using very low value COGs next to oscillators as the primary local decoupler with an X7r ( larger vale) near by can be beneficial, this was for frequency hopping radios...
The other advantage of X7R caps is the small sizes achievable again a benefit for high speed digital decoupling (and always remember the speed of a digital signal is determined by its rise time, so even with a relatively slow clock frequency you may still have a high speed digital signal to work with).
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Old 2nd December 2016, 08:54 AM   #40
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Many years ago I had on loan a 800 MHz scope. To test a theory I measureed the power rails in a cheap Teac CD player. Nearly every point I measured showed considerable noise which looked not unlike music albeit very high frequency. I wasn't really trying to see that problem, just testing the scope. The point to note is this noise vanished at the decoupling cap. It is tempting to think as Crystal recomended that soldering that decoupling cap by hand as close to the chip as possible would be worth considering. I am really glad this came up in this thread, I would never have guess X7R better for this reason. My brother said XR7 inductance was lower than most which he thought the real issue ( size ? ). Perhaps. He was a TV expert. The main reason I ask questions at DIY is he isn't here now. Always have a flu jab, he should have.
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