Maybe the resistor's pad and parastic inductance add some discontinuity for your clock transsmission path. What for do you measure the clock random jitter? Tesla. At 2013-01-09 18:39:39,"vinod ah" <ah.vinod@xxxxxxxxx> wrote: >Hi all, >I am measuring a Random jitter of parallel resonant crystal clock on a >tablet board. I plotted histogram and found it to be in bell shape >i.e. Gaussian distribution. > >But when i add a series resistor to reduce the drive current to crystal, i >find that the histogram shape changes to bi-modal i.e. the one which we get >when we have both Random jitter and Deterministic jitter. > >I am unable to understand the crystal clock jitter behavior after adding >drive control resistor. I dont see any changes in waveform shape when i >measure it in oscilloscope, neither the crystal is having any trouble in >starting up. > >Regards >Vinod A H > > >------------------------------------------------------------------ >To unsubscribe from si-list: >si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > >or to administer your membership from a web page, go to: >//www.freelists.org/webpage/si-list > >For help: >si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > >List forum is accessible at: > http://tech.groups.yahoo.com/group/si-list > >List archives are viewable at: > //www.freelists.org/archives/si-list > >Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu