Tript testing brief status report test setup description
Trip-t testing brief status report test setup description - hardware and software some very early results - scope pictures – too early to draw firm conclusions Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05
Test set-up Lab. VIEW VME Programmable Digital Pattern Generator ck and trig. ADC ~12 control lines preamp int. /reset pipeline, multiplexer, programming level shift d. ECL -> 2. 5 V CMOS Qinj Trip-t Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05 Scope
Photos Trip-t (1 st version) charge injection split between 2 adjacent channels 2. 5 V CMOS control lines Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05
Photos Trip-t board d. ECL -> 2. 5 V CMOS level shift ADC digital pattern generator d. ECL outputs Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05
Test software trip-t on-chip register values to program window showing trip-t programming data to be serially clocked in Lab. VIEW VI allows to generate, edit & load pattern generator with bit streams to program and run trip-t output patterns (i. e. pulse widths) variable with 25 ns resolution window showing pipeline clock signal - 1’s and 0’s clocked out serially (at 40 MHz) Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05 software not polished but in working state – can program and run chip, and inject test pulses
output pictures signal from pattern generator 4 p 7 47 p 4. 7 p. F channel Qin=0. 012 p. C trip-t split between 2 trip-t inputs 47 p. F channel Qin=0. 124 p. C Acquisition sequence: 1. 1) set Pre. Reset and Pipe. Clocks 2. running 3. 2) inject signal during preamp 4. integrate period 5. 3) wait for programmed pipeline 6. depth to elapse (default 31) 7. 4) send trigger to chip (SKIPB) 8. 5) run the output MUX A-pulse output trip-t parameters set to default values Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05
output pictures – A and t pulses CAUTION: these are VERY early results – don’t draw firm conclusions – things will likely change A-pulse 0. 124 p. C on 47 p. F channel 0. 012 p. C on 4. 7 p. F channel t-pulse blue = 0. 124 p. C on 47 p. F chan. t-pulse generated for this channel only green = 0. 385 p. C on 47 p. F chan. t-pulse generated for this channel only amplitude slightly bigger orange = 1. 24 p. C on 47 p. F chan. t-pulse generated for both channels because low 4. 7 p. F channel now getting 0. 124 p. C Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05
output pictures – discriminator output CAUTION: these are VERY early results – don’t draw firm conclusions – things will likely change charge injection signal integrate reset Preamp Reset Pipeline Clock digital signals not very clean – need to improve in test setup Qin = 0. 124 p. C Qin = 0. 385 p. C discriminator output for 47 p. F channel Qin = 1. 24 p. C region expanded on next page Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05 For these results the discriminator outputs were permanently enabled Þsignal appears immediately (don’t have to read out during preamp reset period)
output pictures – discriminator output CAUTION: these are VERY early results – don’t draw firm conclusions – things will likely change charge injection signal Preamp Reset Pipeline Clock Qin = 0. 124 p. C Qin = 0. 385 p. C discriminator output for 47 p. F channel Qin = 1. 24 p. C discriminator output timewalk ~ dominated by charge injection risetime Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05
current status and things to do main effort so far on assembling test setup and basic software test setup hardware in place, basic software to program and run chip exists some improvements desirable (e. g. improve digital signals) need to integrate VME ADC – mainly software effort (day or two’s work) can then begin more systematic investigation of chip performance things to look at chip performance with test pulses gain, linearity, time resolution, noise … get deeper understanding of functionality and characteristics investigate effect of changing bias register parameters performance with Si. PMs verify feasibility of 2 different gains/Si. PM LED pulses and scintillator signals lots to do – need to prioritise Mark Raymond - m. raymond@imperial. ac. uk - 17/10/05
- Slides: 10