Considering all Noise Sources over a single data and power pair IEEE802.3bp Task Force

Transcription

1 Considring all Nois Sourcs ovr a singl data and powr pair IEEE80.3bp Task Forc Channl Dfinition ad-hoc May 013. Yair Darshan, Microsmi ydarshan@microsmi.com

2 Objctivs To nsur that w covr all potntial nois sourcs ovr th data pair for spcifying th total diffrntial maximum nois ovr th data pair. Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013

3 n(f) = Maximum Nois Vs Frquncy Rquirmnt W nd to know th maximum rms nois. n as function of frquncy in which data spcification is mt. Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013 3

4 EMI nois sourc EMI is on of th nois sourcs that gnrat DM nois Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013 4

5 Powr sourc and load nois sourcs If powr is dlivrd ovr th sam data pair, w hav additional nois sourcs at nar nd (powr supply nois) and far nd (load nois.g. DC/DC convrtr nois) Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013 5

6 Mor about Powr Sourc Nois Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013 6

7 Proposd gnral cas for nois sourcs RL is th nois gnratd by th rturn loss during transmission. othr is othr nois sourcs that w may add to th list including dsign margin Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013 7

8 Working assumption mi on both nds is th sam quantity othr is unknown nois sourc or a dsign margin ps and pd ar indpndnt nois sourcs RL on both sids is th sam quantity As a rsult: Total Worst Cas Nois on ach nd is(*): Assuming all sourcs hav th sam wight: Th uppr limit spc. for ach nois sourc as function of frquncy: n( f) rms( f) = 0.4 n( f) 6 Which is ~7.8dB blow n. (*) If thr is mor nois sourcs th modl abov can b xtndd accordingly) n n mi + ps + = 6 pd + RL + othr Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013 8

9 Mor about th valuation of spc limits Thr ar othr ways to plug in th dsign margin. Probably diffrnt ways will gnrat a bit diffrnt rsults. Without dsign margin, du to 4 known nois sourcs, th total nois with th sam working assumptions shown prviously will b: n mi + ps + pd + RL = 4 Th uppr limit spc. for ach nois sourc as function of frquncy: This is ~6dB blow n. (not including dsign margin) Th gnral cas for th uppr limit of a nois sourc of a list of S nois sourcs: rms rms n( f) ( f) = 0.5 n( f) 4 ( f) n ( f) S Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013 9

10 Summary Thr ar additional nois sourcs that ar ndd to b considrd whn nois limits ar dfind for mi(f) or any othr nois sourc. Whn total n(f) is known, any nois sourc i(f) nd to mt: i(f) < n(f) by at last -10*log(S)[dB] for any nois sourc I, from a list of i=1 to S nois sourcs assuming all nois sourcs ar givn th sam wight/importanc ratio. Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May

11 Proposd nxt stps To gt n(f) tst data that nsurs mting data rquirmnts ovr th spcifid channl. To gnrat a list of all known nois sourcs To driv th spc valus for ach nois sourc. It is highly practical from powr sourc and load point of viw, to dfin a dtaild tabl of diffrntial nois pr frquncy ovr th frquncy rang of intrst. It is important to dfin th nois also for low frquncis outsid th transmitting rang.g. from 1-Hz to 1-10MHz. It will allow mor flxibility and cost ffctiv powr sourc whn powr ovr data will b implmntd. Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May

12 Discussion Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May 013 1

13 Thank You Considring all Nois Sourcs ovr singl data and powr pair. Yair Darshan, May