N- XYTER Front-End Boards Christian J. Schmidt, GSI Darmstadt CBM STS Workshop, Karelia, June 1 –...
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Transcript of N- XYTER Front-End Boards Christian J. Schmidt, GSI Darmstadt CBM STS Workshop, Karelia, June 1 –...
n-XYTER
Front-End Boards
Christian J. Schmidt,
GSI Darmstadt
CBM STS Workshop, Karelia, June 1 – 4, 2009
CBM STS Workshop, Karelia, June 1 – 4, 2009
chargepreamp
FASTshaper 18.5 ns
peaking
SLOW shaper(2 stages)
140 ns peaking time
Peakdetector &
hold,free running
comparatorTime Walk
Compensationcircuit
PDHreset
pulse height
output
triggertimestamp reg.
chargeinput
Data Driven Front-End: Asynchronous Channel Trigger
dig. FIFO
analogue FIFO
Asynchronous registry and storage in
4-level fifo guarantees data loss < 4 %
when read-out through token ring
The DETNI ASIC 1.0, a front-end evaluation chip in AMS 0.35µ
detection of statistical, poisson distributed signals
Read-out through balancing token ring 32 MHz data registry and read-out
CBM STS Workshop, Karelia, June 1 – 4, 2009
n-XYTER Front-End Topology
CBM STS Workshop, Karelia, June 1 – 4, 2009
"Simple" FEB for the n-XYTER Starter Kit
A simple hybrid PCB with signal fan-in, ADC and interconnect to SysCore DAQ chain
Allow development of the DAQ chain
Allow the readout of various detector prototypes, using the n-XYTER front-end chip
CBM STS Workshop, Karelia, June 1 – 4, 2009
n-XYTER FEB: At the limits of PCB-technology
Chip-In-Board solution avoids space eating vias
allows pitch adaptation: 50,7 µm on chip to
PCB side 101,4 µm on two levels
Interference point of many technologies,
each imposing limiting boundary conditions:
A simple hybrid PCB with signal fan-in, ADC and interconnect to SysCore DAQ chain
CBM STS Workshop, Karelia, June 1 – 4, 2009
n-XYTER FEB Rev. C
In spite of bonding difficulties, managed to realize
10 Rev. C boards, fully functional
4 rev. B boards with 64 channels functional (the other 64 may be employed for direct silicon det. tests)
We are striving to get the entire system (FEB, SysCore, software) packaged to allow shipment.
Starter kits in distribution
Teams from Colcatta, Kiew, Dubna, Dubna (MPD), GSI, Heidelberg were introduced into running the starter kit with FEB and data chain at the GSI detector lab
CBM STS Workshop, Karelia, June 1 – 4, 2009
Complex Mulitlayer Data Chain
Detector n-XYTER-FEB
n-XYTER FEB and Bonding Technology Documentation (Manual, newest version this May with update on
parameter description) ADC Interconnect
SysCore Firmware Embedded software Soft configuration
Ethernet-Interconnect PC and DAQ
KNUT GUI DAQ System DABC
Software design freeze 1.7, firmware, software, knut
Under heavy development (Anton Lymanets): low level diagnostic toolbox for system analysis to make successful deployment in other labs feasible
CBM STS Workshop, Karelia, June 1 – 4, 2009
Additional: Mimicing Triggered Mode of Operation
Discussions with Petr Nomokonov revealed a nice and simple mode of forcing n-XYTER to operate classically in triggered mode: Switch chip to test trigger mode
Switch off test pulse enable (important as would otherwise imply a special test mode)
Test trigger signal will sample all signals during monostable activity, window determined by "iota" parameter 120ns to several µs.
Alow to study noise all the way to the pedestal, where self triggered normal mode of operation would drown in triggers!
CBM STS Workshop, Karelia, June 1 – 4, 2009
chargepreamp
FASTshaper 18.5 ns
peaking
SLOW shaper(2 stages)
140 ns peaking time
Peakdetector &
hold,free running
comparatorTime Walk
Compensationcircuit
PDHreset
pulse height
output
triggertimestamp reg.
chargeinput
Test Trigger Mode alows globally triggered signal sampling
dig. FIFO
analogue FIFO
The DETNI ASIC 1.0, a front-end evaluation chip in AMS 0.35µ
test trigger input in test trigger mode
CBM STS Workshop, Karelia, June 1 – 4, 2009
n-XYTER FEBs
FEB-Rev D: next version to implement all learnings Relieve PCB specs by tightening bonding necessities and challenge
Chip-In-Board, two layer bonding and metal in-lay cooling contact
GEM-TPC FEB: ongoing dual n-XYTER for PANDA GEM-TPC
n-XYTER Quattro: STS-Baby-Sensor double sided readout towards a beam telescope
Mid-term: Hybrid development for demonstrators (see Volker Kleipas talk tomorrow)
several n-XYTERs on Silicon-circuitboard
CBM STS Workshop, Karelia, June 1 – 4, 2009
n-XYTER Quatro: Double Sided Silicon Readout Read-Out of double sided Si,
256 x 256 channels
First setup to occupy complete capacities of one SysCore
Several Moduls may be set-up to make a beam telescope
FEE of both sides live on one potential! Rely upon readout-caps!
CBM STS Workshop, Karelia, June 1 – 4, 2009
n-XYTER Quattro
four chips bonded on one board (Carmen Simons at GSI DetLab)
currently under tests
then: bond a CBM baby sensor on one
side only and test
bond both sides and test
We will make 4 = 3 +spare beam telescope elements for September beamtime at GSI
CBM STS Workshop, Karelia, June 1 – 4, 2009
Feb Rev D, Layout – Start a new with Eagle Software
Eagle allows script based layout
Generate real footprint
Much easier to follow nets
Easily make bond-plan
Input pitch 5.4 mils = 137µ
Max bonding angle 22°
Max bond length 3.4 mm
Targeted but may not be ready for beam-time
Enhance availability of starter kits
CBM STS Workshop, Karelia, June 1 – 4, 2009
Preparation of Engineering Run (H.K. Soltveit) Test Pulser
Identified very narrow line in test-pulse engine that introduces non-linearity of pulser
Cal setting changes power consumption 0 to 10mW implications to DC-level in current prototype through Temp Coeff. of shapers
Discriminator was designed as "above pedestal trigger" not linear over full threshold span i.e. S-curves are non-linear, explains
beamtime gain conundrum
Temperature coefficient in shapers addressed: modification gives 0.2 mV/K, down from 20 mV/K, simulated 50 to 90°C
Observed Monostable crosstalk identified and addressed
End of June 2009: Engineering run schematics review meeting
End of July 2009: Submission readyness review meetingThen submission
Expect chips in Sept/Oct.
CBM STS Workshop, Karelia, June 1 – 4, 2009
Some In-Channel Discriminator Feedback Detected
...upon removal of discriminator-power decoupling
These issues are particularly important with the self triggered architecture!
They will be addressed even more in the next engineering run.
correlates with internal discriminator trigger
correlates with external test-pulse release signal (blue)
CBM STS Workshop, Karelia, June 1 – 4, 2009
Investigating Individual Channels, Triggerefficiency
Trigger efficiency in Treshold Scan: The S-Curvesused to be the technique to get analogue signal information w/o ADC
- Input of test pulses at fixed rate,- scan threshold while measuring detection rate
Derivative gives image of noise!
This scale is not linearwith pulse height, i.e. input charge!
Caveat information on discriminator operation
CBM STS Workshop, Karelia, June 1 – 4, 2009
Thermographic Analysis: n-XYTER in Action
Chip temperature around 70°C on FEB with simple passive cooler
Digital readout and Time Stamp Clk Distribution surprisingly the hottest part
CBM STS Workshop, Karelia, June 1 – 4, 2009
Conclusions
Starter Kits begin to become available Feb Rev C+ fully bonded with SysCore
Feb Rev D high yield, fabricatable FEB
Data chain went through extensive debugging phase, currently software consolidating, tools for beam-time
Engineering run really in preparation, chips expected Sept./Oct. many learnings addressed
future n-XYTER will be cured from child deseases and design-mishaps
black box operation much more feasible
n-XYTER on Silicon circuit board technology on the radar
parallel activity on CBM-XYTER development ongoing
CBM STS Workshop, Karelia, June 1 – 4, 2009
CBM STS Workshop, Karelia, June 1 – 4, 2009
New Detector Lab Facilities at GSI
600 m2 of climatized cleanroom space with relative humidity down to 20% cleanroom class 10000 in general and better locally
dedicated bonding labs forseen
Additional 600 m2 available for detector testing, storage and other activities
Additional 100 m2 of high clearance (10m headroom), dedicated device setup space (detector integration and tests)
Construction of the new GSI Detector Lab has commenced! Located between GSI UNILAC and the CBM Offices (C27)
CBM STS Workshop, Karelia, June 1 – 4, 2009