Hi guys,
Need your inputs about on how to measure noise in USB and how to remove it.Thanks in advance.
Need your inputs about on how to measure noise in USB and how to remove it.Thanks in advance.
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Re: Usb Noise
you would measure it with a scope
remove it with a higher grade filter cap with less ripple and lower ESRCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me -
Re: Usb Noise
or USB cables that have a ferrite filter might helpCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM meComment
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Re: Usb Noise
thanks for the helpComment
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Re: Usb Noise
For USB 2.0, you would need a high frequency scope with a USB tolerance indicator.My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.Comment
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Re: Usb Noise
Series L, shunt C. Be careful the L you pick (and the C too) if you're going to put them in series with the D+/D- lines as you can add too much impedance and affect the USB signals. Try putting the filters on the power and ground first.
Are you trying to prevent USB signals from radiating out, or prevent external RFI from getting in?Comment
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Re: Usb Noise
Hi sixer, the answer is both.Comment
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Re: Usb Noise
Are you worried about noise in the power or in the signal?
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Using a cable with a ferrite would fix both.
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Re: Usb Noise
xformer: I think some more information about your situation will help us help you here. Is this a product you are designing or a COTS product you have purchased? Are you having trouble passing FCC Part 15 or do you have some sort of interference/RFI problem that you are trying to mitigate? If so, what is the source of the offending radiation and/or what are the devices that this USB product is offending? What is the product in question (or at least the chipset)? Be verbose
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