Heidelberg weekly meeting

03.410 (Physikalisches Institut, Heidelberg)


Physikalisches Institut, Heidelberg


For Vidyo please use room extension 10823320 or use this link.

    • 14:00 14:45
      Round Table 45m

      Reports of work progress

      Speakers: Adrian Herkert (Physikalisches Institut, Uni Heidelberg), Alena Weber (Universität Heidelberg), Andre Schoening (University Heidelberg, Institute of Physiscs), Annie Meneses Gonzalez (PhD Student), Benjamin Weinläder (PI Heidelberg), David Maximilian Immig (Universität Heidelberg), Frank Meier Aeschbacher (Universität Heidelberg), Heiko Augustin (PI Uni Heidelberg), Jan Hammerich (PI Heidelberg), Lars Noehte (PI Heidelberg), Luigi Vigani (University of Oxford), Sebastian Dittmeier (Physikalisches Institut, Universität Heidelberg), Thomas Theodor Rudzki (Physikalisches Institut Heidelberg)

      Present: André Schöning, Lars Noehte, Benjamin Weinläder, Heiko Augustin, @testbeam: David Immig, Luigi Vigani, Annie Meneses, Dohun Kim, vidyo: Frank Meier, Alena Weber, Jan Hammerich

      Minute-taker: HA


      DI: Testbeam report:
      Many problems, main issue found just before start of data taking, newest version of firmware (stratix re-compile after aria5 merge) causes reduced DUT efficiency.
      Very educational: Students learn a lot, introduction to analyse framework for DK.
      Data taking about to start.
      A lot of problems with Mimosa, due to old age.

      LN: Presents Measurements with the flexprint bonded chip.
      Eye Diagramm of Date link 4: 2.3 mV noise rms, 43.7ps, jitter rms; but small amplitude: 30 mV

      DI: Did you look into the first link.

      LN: not yet, but it was observed that link 1 was always systematically better than link 4 (PhD-Thesis Sebastian Dittmeier).
      Eye obtained with setting with settings that minimised the drawn current.
      Eyediagram reveals a slow rise time for the data signal, which explain why the amplitude is reduced on purpose, to allow a bit value change to happen in time.

      LN:[presents frequency scan from the spectrum analyser]

      Plot of Sync_reset and Ref_Clock path
      Foundamental frequencies are marked with red lines 625 Mhz, 1.25 GHz, 1.875 GHz
      Noise smaller  than -60dBm.
      Clear Amplitude drop around 1.25GHz

      Plot unshielded twisted pair:
      Overall damping, still need to look into it. Currently crocodile clamps used in parts of the setup (?)

      AS: twisted pair runs better at high frequencies?? How much power is required for a succesfull signal transmission?
      Is the scale correct? dBm or dB? really below 1mW signals? (-->take offline)

      AS: everyone busy with review preparation.

      AW and HA: preparation of review

      FM: no news


    • 14:45 14:55