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MPPC readout electoronics

MPPC readout electoronics. M.Taguchi(kyoto). MPPC readout with DAQ board. -5V. OPAMP. -. +. DAQ board. 4m flat cable. Trip-t. OUT_P. OUT_N. gain=1. +5V. MPPC. control signal. LED. trig. Labview. trig. DAQ board. Labview. timing を合わせる. MUX_CLK. MUX_CLK. Trip-t.

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MPPC readout electoronics

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  1. MPPC readout electoronics M.Taguchi(kyoto)

  2. MPPC readout with DAQ board -5V OPAMP - + DAQ board 4m flat cable Trip-t OUT_P OUT_N gain=1 +5V MPPC control signal LED trig Labview

  3. trig DAQ board Labview timingを合わせる MUX_CLK MUX_CLK Trip-t

  4. MUX_CLK from DAQ board MUX_CLK from Labview A_OUT from Trip-t (test charge)

  5. Trip-t OPAMP DAQ cable

  6. ADC distribution(test charge) ADC count

  7. Trip-t A_OUT gain 3pF 1pF preamp pipeline charge preamp gain x1 or x4 pipeline gain x2,x4,x8…

  8. A_OUT of MPPC preamp gain=x4 pipeline gain=x1

  9. ADC distribution 400pixel V=70.0V preamp gain=x4 pipeline gain=x1 not same

  10. A_OUT Linearity MPPC 10p.e. (G=7.5x105) preamp gain=x4, pipeline gain=x2 • low signal linearity problem associates with this version of chip preamp gain=x4, pipeline gain=x1 preamp gain=x1, pipeline gain=x4

  11. A_OUT of MPPC preamp gain=x1, pipeline gain=x4

  12. ADC distribution(2) 400pixel V=70.0V preamp gain=x1 pipeline gain=x4 same

  13. MPPC gain measured by Trip-t and CAMAC by Trip-t by CAMAC • 100pixel • 400pixel 1x106 3x106 4x105 1x106

  14. crosstalk of A_OUT • preamp gain=x1, • pipeline gain=x4 • 1.4pC to ch15 (Dynamic range of Trip-t with this gain setting) • crosstalk~0.4% 0.4% ch

  15. 70.0V 100pix 400pix readout 4MPPCs simultaneously 400pix 400pix

  16. Problem? Problem? V=69.8V V=71.4V V=71.4V • LED trig LED trig PRE_RST MPPC signal after preamp signal • Strange pedestal structure due to charge up on coupling capacitor when bias V up charge on capacitor Trip-t

  17. Problem? V=69.8V V=71.4V • at the bias V we see strange pedestal, raw signal is also strange no problem

  18. backup

  19. There is no special change if we change the values of registers - preamp feedback control - preamp drive current - etc… • now design the board of 32ch MPPC inputs

  20. preamp gain = x1 pipeline gain= x4 variation ~4% A_OUT gain

  21. T_OUT charge Disc_OUT voltage PIPE_CLK time difference

  22. T_OUT linearity • input charge=0.65pC time(ns) time(ns)

  23. variation~25% T_OUT gain

  24. Disc. threshold curve • propability of discri firing • input charge =0.13pC 5Vth unit = 2.5fC ~ 0.02p.e. threshold uncertainty

  25. T_OUT ADC count vs injected charge time walk Time walk

  26. position dependence of PIPE_CLK preamp out PIPE_CLK time(ns)

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