hi thermal noise from its nature is power, not voltage.
Pn = k * T * B k boltzmann constant 1.380662E-23 J/K (VAs/K) T absolute Temperature (Kelvin) B bandwidth Hz this power is delivered from any resistor, regardless of its resistance. (assumed "white", i.e. frequency independent noise) so noise denisty is Pn/B = kT in Watts/Hz as power is P = U * U / R or P = I * I * R (voltage or current squared) you get the sqrt of bandwidth (i.e. Hz^0.5) when you go from power to voltage at a known resistance. U = sqrt(P * R) (with "white", thermal noise the noise denity is frequency independent. Otherwise you would have to integrate over frequency) regards Alois > Hi all > > I have to fill up a knowledge gap about noise. > > The unit of the noise density is mostly nV/"sqrroot"HZ and I don't > really what this likes to tell me. > > Anyone has a good article about this? > > TIA > Edi > > -- > > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > + IH electronic + Phone: ++41 52 320 90 00 + > + Edi Im Hof + Fax: ++41 52 320 90 04 + > + Doernlerstrasse 1, Sulz + URL: http://www.ihe.ch + > + CH-8544 Rickenbach-Attikon + E-Mail: [EMAIL PROTECTED] + > + Switzerland + + > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > -- > Author: Edi Im Hof > INET: [EMAIL PROTECTED] > > Fat City Hosting, San Diego, California -- http://www.fatcity.com > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message to: > [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the > message BODY, include a line containing: UNSUB CHIPDIR-L (or the name > of mailing list you want to be removed from). You may also send the > HELP command for other information (like subscribing). - - - - - - - - - - - - - - - - - - - - - - - - - - Alois Bauer WORK Microwave GmbH Raiffeisenstr. 12, D-83607 Holzkirchen, Germany Tel. {+49} (0)8024-6408-0 / FAX (0)8024-640840 -- Author: Alois Bauer INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
