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J.C Santiard CERN EP-MIC ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS  J.C. Santiard, CERN, Geneva, CH

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Presentation on theme: "J.C Santiard CERN EP-MIC ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS  J.C. Santiard, CERN, Geneva, CH"— Presentation transcript:

1 J.C Santiard CERN EP-MIC ANALOG AND DIGITAL PROCESSING FOR THE READOUT OF RADIATION DETECTORS  J.C. Santiard, CERN, Geneva, CH  K. Marent, IMEC vzw, 3001 Leuven, BE  H. Witters, IMEC vzw, 3001 Leuven, BE  J. Hauser, CMS UCLA  Sh. Chandramouly, CMS UCLA

2 J.C Santiard CERN EP-MIC 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 GASSIPLEX  m tech. (Si) 60 wafers  1998 GASSIPLEX  m tech. (Si) Proto.

3 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) = I 0 B/(1 + t/t 0 ) q(t) = Q 0 ALn (1 + t/t 0 ) A, B and t 0 are constants depending on detector geometry and electric field.  Filtering adaptable to any kind of drift time

4 J.C Santiard CERN EP-MIC 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)/(t 0 +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/ 

5 J.C Santiard CERN EP-MIC PRACTICAL IMPLEMENTATION  3 weighted exponential:  = K 1 /(1 + sT 1 ) + K 2 /(1 + sT 2 ) + K 3 /(1 + sT 3 )  Gain factors: K 1 = 0.2; K 2 = 0.3; K 3 = 0.5  Time constants: T 1 = C 1 /g m1 ; T 2 = C 2 /g m2 ; T 3 = C 3 /g m3

6 J.C Santiard CERN EP-MIC ACTIVE FEEDBACK RESISTOR  Rf = 20 M 

7 J.C Santiard CERN EP-MIC POLE/ZERO CANCEL. RESISTOR  Rp/z = 2.2 M 

8 J.C Santiard CERN EP-MIC SHAPER  NO DIFFERENTIATING CAPACITOR

9 J.C Santiard CERN EP-MIC SIMULATIONS RESULTS  CSA OUTPUT  FILTER OUTPUT  SHAPER OUTPUT

10 J.C Santiard CERN EP-MIC LAYOUT

11 MEASUREMENTS  NOISE Vs Cin  GAIN SPREAD

12 J.C Santiard CERN EP-MIC LINEARITY

13 CALIBRATION

14 SHAPING ON GASEOUS DETECTOR PAD WITH 55 Fe Xray SOURCE

15 J.C Santiard CERN EP-MIC TABLE OF RESULTS(1)  TechnologyMIETEC-0.7  m  Silicon area3.63 x 4 = 14.5 mm 2  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

16 J.C Santiard CERN EP-MIC 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/ 0 C

17 J.C Santiard CERN EP-MIC BLOCK DIAGRAM

18 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

19 J.C Santiard CERN EP-MIC 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


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