ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS - PowerPoint PPT Presentation

Analog and digital processing for the readout of radiation detectors
Download
1 / 19

  • 101 Views
  • Uploaded on
  • Presentation posted in: General

ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS. J.C. Santiard, CERN, Geneva, CH (jean-claude.santiard@cern.ch) K. Marent, IMEC vzw, 3001 Leuven, BE (marentk@imec.be) H. Witters, IMEC vzw, 3001 Leuven, BE (witters@imec.be) J. Hauser, CMS UCLA Sh. Chandramouly, CMS UCLA.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

Download Presentation

ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Analog and digital processing for the readout of radiation detectors

ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS

  • J.C. Santiard, CERN, Geneva, CH (jean-claude.santiard@cern.ch)

  • K. Marent, IMEC vzw, 3001 Leuven, BE (marentk@imec.be)

  • H. Witters, IMEC vzw, 3001 Leuven, BE (witters@imec.be)

  • J. Hauser, CMS UCLA

  • Sh. Chandramouly, CMS UCLA

J.C Santiard CERN EP-MIC


Cern ep mic long p t analog front end development

CERN EP-MIC LONG P.T. ANALOG FRONT-END DEVELOPMENT

  • Long peaking-time(.5 s; 1.2 s) used as delay, waiting for a trigger to memorize on cap. by T/H; multiplexed output.

  • General use

  • 1987 AMPLEX 3m tech. 60 wafers

  • 1990 AMPLEX-SICAL 3m tech. 100 wafers

  • Gaseous detectors

  • 1993 GASPLEX 1.5m tech. 10 wafers

  • 1994 GASSIPLEX1.5 1.5m tech. (Si) 60 wafers

  • 1998 GASSIPLEX0.7 0.7m tech. (Si) Proto.

J.C Santiard CERN EP-MIC


Signal processing for gaseous detectors

Ions drift time of several tens of s from anode to cathode:

i(t) = I0B/(1 + t/t0)

q(t) = Q0ALn (1 + t/t0)

A, B and t0 are constants depending on detector geometry and electric field.

Filtering adaptable to any kind of drift time

SIGNAL PROCESSING FOR GASEOUS DETECTORS

J.C Santiard CERN EP-MIC


Continuous time deconvolution filter

CONTINUOUS TIME DECONVOLUTION FILTER

  • GOAL:RECREATE A STEP FUNCTION FROM THE LOGARITHMIC SHAPE OF THE CHARGE OR A DIRAC PULSE FROM THE CURRENT SIGNAL.

  • Impulse response of detector model with Dirac input:

    • h(t) = U(t)/(t0+t) U(t) is a step function

  • function of the deconvolver G(s) should be:

    • G(s) = H(s)-1 H(s) = L[ h(t) ]

  • 3 exponentials in the feedback of a summing amplifier:

    • G(s) = Vout/Vin = A/(1 + A) ; if A>>, G(s) ~ 1/

J.C Santiard CERN EP-MIC


Practical implementation

3 weighted exponential:

 = K1/(1 + sT1) + K2/(1 + sT2) +

K3/(1 + sT3)

Gain factors:

K1 = 0.2; K2 = 0.3; K3 = 0.5

Time constants:

T1 = C1/gm1 ; T2 = C2/gm2 ;

T3 = C3/gm3

PRACTICAL IMPLEMENTATION

J.C Santiard CERN EP-MIC


Active feedback resistor

ACTIVE FEEDBACK RESISTOR

  • Rf = 20 M

J.C Santiard CERN EP-MIC


Pole zero cancel resistor

POLE/ZERO CANCEL. RESISTOR

  • Rp/z = 2.2 M

J.C Santiard CERN EP-MIC


Shaper

SHAPER

  • NO DIFFERENTIATING CAPACITOR

J.C Santiard CERN EP-MIC


Simulations results

CSA OUTPUT

FILTER OUTPUT

SHAPER OUTPUT

SIMULATIONS RESULTS

J.C Santiard CERN EP-MIC


Layout

LAYOUT

J.C Santiard CERN EP-MIC


Measurements

NOISE Vs Cin

GAIN SPREAD

MEASUREMENTS

J.C Santiard CERN EP-MIC


Linearity

LINEARITY

J.C Santiard CERN EP-MIC


Calibration

CALIBRATION

J.C Santiard CERN EP-MIC


Shaping on gaseous detector pad with 55 fe xray source

SHAPING ON GASEOUS DETECTOR PAD WITH 55Fe Xray SOURCE

J.C Santiard CERN EP-MIC


Table of results 1

TABLE OF RESULTS(1)

  • TechnologyMIETEC-0.7m

  • Silicon area3.63 x 4 = 14.5 mm2

  • Silicon detector mode

  • Gain2.2 mV/fC

  • Dynamic range ( + )900 fC ( 0 to 2 V)

  • Dynamic range ( - )500 fC ( 0 to -1.1 V)

  • Non linearity 3 fC

  • Noise at 0 pF600 e- rms

  • Noise slope12 e- rms/pF

  • Low power mode

  • Power consumption4mW/chan. at 4 MHz

  • Noise at 0 pF600 e- rms

  • Noise slope15 e- rms/pF

J.C Santiard CERN EP-MIC


Table of results 2

TABLE OF RESULTS(2)

  • Gaseous detector mode

  • Peaking time1.2 s

  • Peaking time adjust.1.1 to 1.3 s

  • Noise at 0 pF 530 e- rms

  • Noise slope11.2 e- rms/pF

  • Dynamic range ( + )560 fC ( 0 to 2 V )

  • Dynamic range ( - )300 fC ( 0 to -1.1 V )

  • Gain3.6 mV/fC

  • Non linearity 2 fC

  • Baseline recovery .5% after 5 s

  • Analog readout speed10MHz (50 pF load)

  • Power consumption8mW/chan. at 10 MHz

  • Out. Temp. coeff.0.05 mV/0C

J.C Santiard CERN EP-MIC


Block diagram

BLOCK DIAGRAM

J.C Santiard CERN EP-MIC


Dilogic2 a sparse data scan readout processor

CHARACTERISTICS:

16 TO 64 CHANNELS

PED. SUBTRACTION

ZERO SUPPRESSION

512X18 BITS DATA FIFO

64X16 BITS BITMAP FIFO

4 BITS CONTROLLER

ASYNCHRONOUS R/W

FIFO FLAGS

PROTOTYPES DELIVERY: OCT. 99

DILOGIC2: A SPARSE DATA SCAN READOUT PROCESSOR

J.C Santiard CERN EP-MIC


16 ch lct comp

16-Ch. LCT-COMP

  • USE ON THE CSC ENDCAP MUON DETECTORS IN CMS TO LOCALIZE THE TRACK HIT POSITION TO 1/2 STRIP.

  • COMPARATORS HAVE LOW OFFSET SPREAD: <.9mv rms.

  • SPATIAL RESOLUTION DEPEND MAINLY ON THE INPUT NOISE LEVEL.

  • ON-CHAMBER TESTING WILL BE DONE DURING SUM. 00

  • PRE-PRODUCTION WILL START IN MARCH 00

J.C Santiard CERN EP-MIC


  • Login