MPPC readout electoronics M Taguchikyoto MPPC readout with

MPPC readout electoronics M. Taguchi(kyoto)

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

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

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

Trip-t OPAMP DAQ cable

ADC distribution(test charge) ADC count

Trip-t A_OUT gain 3 p. F 1 p. F preamp pipeline charge preamp gain x 1 or x 4 pipeline gain x 2, x 4, x 8…

A_OUT of MPPC preamp gain=x 4 pipeline gain=x 1

ADC distribution 400 pixel V=70. 0 V preamp gain=x 4 pipeline gain=x 1 not same

A_OUT Linearity MPPC 10 p. e. (G=7. 5 x 105) preamp gain=x 4, pipeline gain=x 2 preamp gain=x 4, pipeline gain=x 1 preamp gain=x 1, pipeline gain=x 4 • low signal linearity problem associates with this version of chip

A_OUT of MPPC preamp gain=x 1, pipeline gain=x 4

ADC distribution(2) 400 pixel V=70. 0 V preamp gain=x 1 pipeline gain=x 4 same

MPPC gain measured by Trip-t and CAMAC by Trip-t by CAMAC • 100 pixel 3 x 106 1 x 106 • 400 pixel 1 x 106 4 x 105

crosstalk of A_OUT • preamp gain=x 1, 0. 4% pipeline gain=x 4 • 1. 4 p. C to ch 15 (Dynamic range of Trip-t with this gain setting) • crosstalk~0. 4% ch

100 pix 400 pix • 70. 0 V readout 4 MPPCs simultaneously 400 pix

V=69. 8 V Problem? V=71. 4 V • LED trig PRE_RST MPPC signal after preamp • Strange pedestal structure due to charge up on coupling capacitor when bias V up signal charge on capacitor Trip-t

Problem? V=69. 8 V • at the bias V we see strange pedestal, raw signal is also strange V=71. 4 V no problem

backup

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

A_OUT gain ch 15 Gain (ADC count/p. C) 730 16 710 31 735 32 732 • preamp gain = x 1 pipeline gain= x 4 • variation ~4%

T_OUT charge Disc_OUT voltage PIPE_CLK time difference

T_OUT linearity time(ns) • input charge=0. 65 p. C time(ns)

T_OUT gain ch Gain (count/ns) 15 8. 52 16 8. 60 31 8. 00 32 9. 97 • variation~25%

Disc. threshold curve • propability of discri firing • input charge =0. 13 p. C 5 Vth unit = 2. 5 f. C ~ 0. 02 p. e. threshold uncertainty

Time walk • T_OUT ADC count vs injected charge • time walk

position dependence of PIPE_CLK preamp out PIPE_CLK time(ns)