1 / 19

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.

bobby
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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

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

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

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

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

  10. LAYOUT J.C Santiard CERN EP-MIC

  11. NOISE Vs Cin GAIN SPREAD MEASUREMENTS J.C Santiard CERN EP-MIC

  12. LINEARITY J.C Santiard CERN EP-MIC

  13. CALIBRATION J.C Santiard CERN EP-MIC

  14. SHAPING ON GASEOUS DETECTOR PAD WITH 55Fe Xray SOURCE J.C Santiard CERN EP-MIC

  15. 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

  16. 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

  17. BLOCK DIAGRAM J.C Santiard CERN EP-MIC

  18. 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

  19. 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

More Related