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 (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.

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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 (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

table of results 1
TABLE OF RESULTS(1)
  • Technology MIETEC-0.7m
  • Silicon area 3.63 x 4 = 14.5 mm2
  • Silicon detector mode
  • Gain 2.2 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 pF 600 e- rms
  • Noise slope 12 e- rms/pF
  • Low power mode
  • Power consumption 4mW/chan. at 4 MHz
  • Noise at 0 pF 600 e- rms
  • Noise slope 15 e- rms/pF

J.C Santiard CERN EP-MIC

table of results 2
TABLE OF RESULTS(2)
  • Gaseous detector mode
  • Peaking time 1.2 s
  • Peaking time adjust. 1.1 to 1.3 s
  • Noise at 0 pF 530 e- rms
  • Noise slope 11.2 e- rms/pF
  • Dynamic range ( + ) 560 fC ( 0 to 2 V )
  • Dynamic range ( - ) 300 fC ( 0 to -1.1 V )
  • Gain 3.6 mV/fC
  • Non linearity  2 fC
  • Baseline recovery  .5% after 5 s
  • Analog readout speed 10MHz (50 pF load)
  • Power consumption 8mW/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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