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 pipeline 3pF 1pF preamp charge preamp gain x1 or x4
pipeline gain x2,x4,x8…

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

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

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

14. crosstalk of A_OUT ch 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? LED trig V=69.8V V=71.4V V=71.4V 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? no 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. A_OUT gain ch Gain (ADC count/pC) 15 730 16 710 31 735 32 732
preamp gain = x1
pipeline gain= x4
variation ~4%

21. T_OUT
charge
Disc_OUT
voltage
PIPE_CLK
time difference

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

23. T_OUT gain ch Gain (count/ns) 15 8.52 16 8.60 31 8.00 32 9.97
variation~25%

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

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

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