Analog and digital processing for the readout of radiation detectors
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ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS. J.C. Santiard, CERN, Geneva, CH ([email protected]) K. Marent, IMEC vzw, 3001 Leuven, BE ([email protected]) H. Witters, IMEC vzw, 3001 Leuven, BE ([email protected]) J. Hauser, CMS UCLA Sh. Chandramouly, CMS UCLA.

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ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS

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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 ([email protected])

  • K. Marent, IMEC vzw, 3001 Leuven, BE ([email protected])

  • H. Witters, IMEC vzw, 3001 Leuven, BE ([email protected])

  • 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


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