[SI-LIST] Re: HSPICE - adding jitter to ethernet serial link
- From: "Hassan O. Ali" <hassan@xxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 15 Feb 2006 12:02:55 -0500
A piece-wise linear (PWL) source implemented as below in an HSPICE subcircuit
may be
used to simulate RJ and DJ effects on the output.
The total jitter (J) factors (e.g. 0.512, 0.221, etc.) in this case were
generated with
a random number generator. The bit pattern is random but is supposed to mimic
an 8B/10B
encoding where the maximum run-length (maximum number of consecutive 1's or
0's) is 5.
The pattern length was arbitrarily chosen as 160 bits.
Mind you, this is just one arbitrary way of including DJ and RJ effects. I'm
sure more
elaborate ways exist.
Best regards.
Hassan.
************************************************
* HSPICE PWL voltage source
* Parameter description:
* TR - Rise/Fall time of the PWL source
* UI - Unit Interval time (Bit width = 1/BitRate)
* HI - Voltage value representing bit "1"
* LO - Voltage value representing bit "0"
* JD - Peak-to-peak deterministic jitter
* JR - Peak-to-peak random jitter
************************************************
.SUBCKT pwl_source node1 node2
+TR=TRval UI=UIval HI=HIval LO=LOval
+JD=JDval JR=JRval
.param J='(JD+JR/2)'
vsrc node1 node2 PWL
+ 0.0 'HI', '0.512*J+UI*1' 'HI',
+ '0.512*J+UI*1+TR' 'LO', '0.221*J+UI*2' 'LO',
+ '0.221*J+UI*2+TR' 'LO', '0.868*J+UI*3' 'LO',
+ '0.868*J+UI*3+TR' 'LO', '0.358*J+UI*4' 'LO',
+ '0.358*J+UI*4+TR' 'LO', '0.379*J+UI*5' 'LO',
+ '0.379*J+UI*5+TR' 'HI', '-0.003*J+UI*6' 'HI',
+ '-0.003*J+UI*6+TR' 'LO', '0.2*J+UI*7' 'LO',
+ '0.2*J+UI*7+TR' 'LO', '0.238*J+UI*8' 'LO',
+ '0.238*J+UI*8+TR' 'LO', '0.197*J+UI*9' 'LO',
+ '0.197*J+UI*9+TR' 'LO', '-0.424*J+UI*10' 'LO',
+ '-0.424*J+UI*10+TR' 'HI', '-0.608*J+UI*11' 'HI',
+ '-0.608*J+UI*11+TR' 'HI', '-0.47*J+UI*12' 'HI',
+ '-0.47*J+UI*12+TR' 'LO', '-0.124*J+UI*13' 'LO',
+ '-0.124*J+UI*13+TR' 'LO', '-0.094*J+UI*14' 'LO',
+ '-0.094*J+UI*14+TR' 'LO', '-0.657*J+UI*15' 'LO',
+ '-0.657*J+UI*15+TR' 'HI', '0.48*J+UI*16' 'HI',
+ '0.48*J+UI*16+TR' 'LO', '-0.052*J+UI*17' 'LO',
+ '-0.052*J+UI*17+TR' 'LO', '0.208*J+UI*18' 'LO',
+ '0.208*J+UI*18+TR' 'HI', '-0.15*J+UI*19' 'HI',
+ '-0.15*J+UI*19+TR' 'HI', '-0.097*J+UI*20' 'HI',
+ '-0.097*J+UI*20+TR' 'LO', '0.089*J+UI*21' 'LO',
+ '0.089*J+UI*21+TR' 'LO', '-0.535*J+UI*22' 'LO',
+ '-0.535*J+UI*22+TR' 'LO', '0.096*J+UI*23' 'LO',
+ '0.096*J+UI*23+TR' 'LO', '-0.433*J+UI*24' 'LO',
+ '-0.433*J+UI*24+TR' 'LO', '0.603*J+UI*25' 'LO',
+ '0.603*J+UI*25+TR' 'LO', '-0.119*J+UI*26' 'LO',
+ '-0.119*J+UI*26+TR' 'HI', '-0.847*J+UI*27' 'HI',
+ '-0.847*J+UI*27+TR' 'HI', '-0.234*J+UI*28' 'HI',
+ '-0.234*J+UI*28+TR' 'HI', '-0.056*J+UI*29' 'HI',
+ '-0.056*J+UI*29+TR' 'LO', '-0.535*J+UI*30' 'LO',
+ '-0.535*J+UI*30+TR' 'LO', '-0.564*J+UI*31' 'LO',
+ '-0.564*J+UI*31+TR' 'HI', '-0.191*J+UI*32' 'HI',
+ '-0.191*J+UI*32+TR' 'LO', '0.16*J+UI*33' 'LO',
+ '0.16*J+UI*33+TR' 'LO', '-0.552*J+UI*34' 'LO',
+ '-0.552*J+UI*34+TR' 'LO', '0.277*J+UI*35' 'LO',
+ '0.277*J+UI*35+TR' 'HI', '-0.491*J+UI*36' 'HI',
+ '-0.491*J+UI*36+TR' 'LO', '0.463*J+UI*37' 'LO',
+ '0.463*J+UI*37+TR' 'LO', '-0.166*J+UI*38' 'LO',
+ '-0.166*J+UI*38+TR' 'HI', '-0.592*J+UI*39' 'HI',
+ '-0.592*J+UI*39+TR' 'HI', '0.667*J+UI*40' 'HI',
+ '0.667*J+UI*40+TR' 'LO', '-0.296*J+UI*41' 'LO',
+ '-0.296*J+UI*41+TR' 'LO', '-0.11*J+UI*42' 'LO',
+ '-0.11*J+UI*42+TR' 'HI', '-0.608*J+UI*43' 'HI',
+ '-0.608*J+UI*43+TR' 'HI', '-0.351*J+UI*44' 'HI',
+ '-0.351*J+UI*44+TR' 'LO', '0.818*J+UI*45' 'LO',
+ '0.818*J+UI*45+TR' 'HI', '-0.365*J+UI*46' 'HI',
+ '-0.365*J+UI*46+TR' 'LO', '0.201*J+UI*47' 'LO',
+ '0.201*J+UI*47+TR' 'LO', '-0.247*J+UI*48' 'LO',
+ '-0.247*J+UI*48+TR' 'LO', '0.446*J+UI*49' 'LO',
+ '0.446*J+UI*49+TR' 'HI', '0.329*J+UI*50' 'HI',
+ '0.329*J+UI*50+TR' 'LO', '0.706*J+UI*51' 'LO',
+ '0.706*J+UI*51+TR' 'HI', '-0.165*J+UI*52' 'HI',
+ '-0.165*J+UI*52+TR' 'LO', '0.302*J+UI*53' 'LO',
+ '0.302*J+UI*53+TR' 'LO', '0.03*J+UI*54' 'LO',
+ '0.03*J+UI*54+TR' 'HI', '0.152*J+UI*55' 'HI',
+ '0.152*J+UI*55+TR' 'LO', '-0.255*J+UI*56' 'LO',
+ '-0.255*J+UI*56+TR' 'HI', '-0.237*J+UI*57' 'HI',
+ '-0.237*J+UI*57+TR' 'LO', '0.014*J+UI*58' 'LO',
+ '0.014*J+UI*58+TR' 'LO', '0.64*J+UI*59' 'LO',
+ '0.64*J+UI*59+TR' 'LO', '-0.162*J+UI*60' 'LO',
+ '-0.162*J+UI*60+TR' 'LO', '0.311*J+UI*61' 'LO',
+ '0.311*J+UI*61+TR' 'LO', '0.33*J+UI*62' 'LO',
+ '0.33*J+UI*62+TR' 'LO', '-0.301*J+UI*63' 'LO',
+ '-0.301*J+UI*63+TR' 'HI', '-0.513*J+UI*64' 'HI',
+ '-0.513*J+UI*64+TR' 'LO', '0.102*J+UI*65' 'LO',
+ '0.102*J+UI*65+TR' 'LO', '-0.695*J+UI*66' 'LO',
+ '-0.695*J+UI*66+TR' 'LO', '-0.308*J+UI*67' 'LO',
+ '-0.308*J+UI*67+TR' 'LO', '-0.444*J+UI*68' 'LO',
+ '-0.444*J+UI*68+TR' 'LO', '0.387*J+UI*69' 'LO',
+ '0.387*J+UI*69+TR' 'LO', '-0.031*J+UI*70' 'LO',
+ '-0.031*J+UI*70+TR' 'HI', '-0.599*J+UI*71' 'HI',
+ '-0.599*J+UI*71+TR' 'LO', '-0.071*J+UI*72' 'LO',
+ '-0.071*J+UI*72+TR' 'LO', '0.077*J+UI*73' 'LO',
+ '0.077*J+UI*73+TR' 'HI', '0.663*J+UI*74' 'HI',
+ '0.663*J+UI*74+TR' 'HI', '-0.526*J+UI*75' 'HI',
+ '-0.526*J+UI*75+TR' 'LO', '0*J+UI*76' 'LO',
+ '0*J+UI*76+TR' 'LO', '0.193*J+UI*77' 'LO',
+ '0.193*J+UI*77+TR' 'LO', '0.479*J+UI*78' 'LO',
+ '0.479*J+UI*78+TR' 'LO', '-0.055*J+UI*79' 'LO',
+ '-0.055*J+UI*79+TR' 'HI', '0.161*J+UI*80' 'HI',
+ '0.161*J+UI*80+TR' 'LO', '0.404*J+UI*81' 'LO',
+ '0.404*J+UI*81+TR' 'LO', '-0.249*J+UI*82' 'LO',
+ '-0.249*J+UI*82+TR' 'HI', '-0.255*J+UI*83' 'HI',
+ '-0.255*J+UI*83+TR' 'LO', '-0.668*J+UI*84' 'LO',
+ '-0.668*J+UI*84+TR' 'HI', '-0.481*J+UI*85' 'HI',
+ '-0.481*J+UI*85+TR' 'LO', '0.553*J+UI*86' 'LO',
+ '0.553*J+UI*86+TR' 'LO', '0.16*J+UI*87' 'LO',
+ '0.16*J+UI*87+TR' 'HI', '0.392*J+UI*88' 'HI',
+ '0.392*J+UI*88+TR' 'LO', '-0.056*J+UI*89' 'LO',
+ '-0.056*J+UI*89+TR' 'LO', '0.267*J+UI*90' 'LO',
+ '0.267*J+UI*90+TR' 'LO', '0.384*J+UI*91' 'LO',
+ '0.384*J+UI*91+TR' 'LO', '0.79*J+UI*92' 'LO',
+ '0.79*J+UI*92+TR' 'LO', '-0.734*J+UI*93' 'LO',
+ '-0.734*J+UI*93+TR' 'LO', '-0.006*J+UI*94' 'LO',
+ '-0.006*J+UI*94+TR' 'HI', '-0.01*J+UI*95' 'HI',
+ '-0.01*J+UI*95+TR' 'HI', '-0.039*J+UI*96' 'HI',
+ '-0.039*J+UI*96+TR' 'LO', '0.648*J+UI*97' 'LO',
+ '0.648*J+UI*97+TR' 'HI', '0.099*J+UI*98' 'HI',
+ '0.099*J+UI*98+TR' 'LO', '0.409*J+UI*99' 'LO',
+ '0.409*J+UI*99+TR' 'HI', '0.808*J+UI*100' 'HI',
+ '0.808*J+UI*100+TR' 'HI', '0.458*J+UI*101' 'HI',
+ '0.458*J+UI*101+TR' 'LO', '0.709*J+UI*102' 'LO',
+ '0.709*J+UI*102+TR' 'LO', '0.489*J+UI*103' 'LO',
+ '0.489*J+UI*103+TR' 'HI', '0.309*J+UI*104' 'HI',
+ '0.309*J+UI*104+TR' 'LO', '0.637*J+UI*105' 'LO',
+ '0.637*J+UI*105+TR' 'LO', '0.225*J+UI*106' 'LO',
+ '0.225*J+UI*106+TR' 'LO', '-0.052*J+UI*107' 'LO',
+ '-0.052*J+UI*107+TR' 'HI', '-0.1*J+UI*108' 'HI',
+ '-0.1*J+UI*108+TR' 'HI', '0.288*J+UI*109' 'HI',
+ '0.288*J+UI*109+TR' 'LO', '-0.219*J+UI*110' 'LO',
+ '-0.219*J+UI*110+TR' 'LO', '-0.129*J+UI*111' 'LO',
+ '-0.129*J+UI*111+TR' 'LO', '0.035*J+UI*112' 'LO',
+ '0.035*J+UI*112+TR' 'LO', '0.131*J+UI*113' 'LO',
+ '0.131*J+UI*113+TR' 'HI', '-0.23*J+UI*114' 'HI',
+ '-0.23*J+UI*114+TR' 'LO', '0.24*J+UI*115' 'LO',
+ '0.24*J+UI*115+TR' 'LO', '0.684*J+UI*116' 'LO',
+ '0.684*J+UI*116+TR' 'LO', '0.027*J+UI*117' 'LO',
+ '0.027*J+UI*117+TR' 'HI', '0.351*J+UI*118' 'HI',
+ '0.351*J+UI*118+TR' 'LO', '-0.562*J+UI*119' 'LO',
+ '-0.562*J+UI*119+TR' 'LO', '0.831*J+UI*120' 'LO',
+ '0.831*J+UI*120+TR' 'LO', '-0.524*J+UI*121' 'LO',
+ '-0.524*J+UI*121+TR' 'HI', '-0.041*J+UI*122' 'HI',
+ '-0.041*J+UI*122+TR' 'HI', '0.675*J+UI*123' 'HI',
+ '0.675*J+UI*123+TR' 'HI', '-0.035*J+UI*124' 'HI',
+ '-0.035*J+UI*124+TR' 'HI', '0.083*J+UI*125' 'HI',
+ '0.083*J+UI*125+TR' 'LO', '-0.247*J+UI*126' 'LO',
+ '-0.247*J+UI*126+TR' 'HI', '-0.372*J+UI*127' 'HI',
+ '-0.372*J+UI*127+TR' 'LO', '-0.44*J+UI*128' 'LO',
+ '-0.44*J+UI*128+TR' 'HI', '-0.861*J+UI*129' 'HI',
+ '-0.861*J+UI*129+TR' 'LO', '0.162*J+UI*130' 'LO',
+ '0.162*J+UI*130+TR' 'HI', '-0.228*J+UI*131' 'HI',
+ '-0.228*J+UI*131+TR' 'HI', '0.606*J+UI*132' 'HI',
+ '0.606*J+UI*132+TR' 'HI', '-0.002*J+UI*133' 'HI',
+ '-0.002*J+UI*133+TR' 'LO', '0.385*J+UI*134' 'LO',
+ '0.385*J+UI*134+TR' 'HI', '0.012*J+UI*135' 'HI',
+ '0.012*J+UI*135+TR' 'LO', '0.14*J+UI*136' 'LO',
+ '0.14*J+UI*136+TR' 'LO', '-0.286*J+UI*137' 'LO',
+ '-0.286*J+UI*137+TR' 'HI', '-0.124*J+UI*138' 'HI',
+ '-0.124*J+UI*138+TR' 'HI', '0.132*J+UI*139' 'HI',
+ '0.132*J+UI*139+TR' 'HI', '0.65*J+UI*140' 'HI',
+ '0.65*J+UI*140+TR' 'LO', '0.422*J+UI*141' 'LO',
+ '0.422*J+UI*141+TR' 'HI', '-0.173*J+UI*142' 'HI',
+ '-0.173*J+UI*142+TR' 'HI', '-0.701*J+UI*143' 'HI',
+ '-0.701*J+UI*143+TR' 'HI', '0.674*J+UI*144' 'HI',
+ '0.674*J+UI*144+TR' 'LO', '-0.063*J+UI*145' 'LO',
+ '-0.063*J+UI*145+TR' 'LO', '0.697*J+UI*146' 'LO',
+ '0.697*J+UI*146+TR' 'HI', '-0.464*J+UI*147' 'HI',
+ '-0.464*J+UI*147+TR' 'HI', '0.241*J+UI*148' 'HI',
+ '0.241*J+UI*148+TR' 'LO', '0.158*J+UI*149' 'LO',
+ '0.158*J+UI*149+TR' 'HI', '0.725*J+UI*150' 'HI',
+ '0.725*J+UI*150+TR' 'LO', '-0.715*J+UI*151' 'LO',
+ '-0.715*J+UI*151+TR' 'HI', '0.379*J+UI*152' 'HI',
+ '0.379*J+UI*152+TR' 'HI', '-0.341*J+UI*153' 'HI',
+ '-0.341*J+UI*153+TR' 'LO', '0.387*J+UI*154' 'LO',
+ '0.387*J+UI*154+TR' 'HI', '-0.158*J+UI*155' 'HI',
+ '-0.158*J+UI*155+TR' 'LO', '0.637*J+UI*156' 'LO',
+ '0.637*J+UI*156+TR' 'LO', '-0.883*J+UI*157' 'LO',
+ '-0.883*J+UI*157+TR' 'LO', '-0.083*J+UI*158' 'LO',
+ '-0.083*J+UI*158+TR' 'HI', '-0.087*J+UI*159' 'HI',
+ '-0.087*J+UI*159+TR' 'HI', '0.573*J+UI*160' 'HI',
.ends
On Feb 15, "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx> wrote:
>
> May be its just me but Rj only makes sense when you are trying to extract a
> BERT curve
which seems to be a MATLAB job.
> If you have your Tx Rj, channel model and jitter transfer of your CDR, the
> rest of the
work is straight forward.
> >
> >
> > At 10:40 AM 2/7/2006 -0800, Ali Burney wrote:
> >
> >> Hi,
> >>
> >>
> >> I am running gigabit Ethernet link simulation using HSPICE and have a=20
> >> question on adding jitter to the transmitted data. Is there any way to=20
> >> add Gaussian jitter to the transmitted data? I know that tools such as
> >>
> >
> >
> >> Hyperlynx allow you to add transmit jitter.
> >>
> >>
> >>
> >> Thanks and best regards,
> >>
> >>
> >>
> >> A Burney
> >>
> >>
> >>
> >>
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