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ASPIC Front-end CCD Readout Circuit For LSST camera

LPNHE C. Juramy, D. Martin, H. Lebbolo, P. Antilogus, P. Bailly, R. Sefri, S. Bailey LAL C. de La Taille, F. Wicek, J. Jeglot , M. Moniez, V. Tocut. ASPIC Front-end CCD Readout Circuit For LSST camera. IN2P3 contribution to camera electronics. IN2P3 contribution:

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ASPIC Front-end CCD Readout Circuit For LSST camera

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  1. LPNHE C. Juramy, D. Martin, H. Lebbolo, P. Antilogus, P. Bailly, R. Sefri, S. Bailey LAL C. de La Taille, F. Wicek, J. Jeglot , M. Moniez, V. Tocut ASPICFront-end CCD Readout CircuitFor LSST camera Sefri Rachid @LPNHE La Londe-les-Maures october2009

  2. IN2P3 contribution to camera electronics IN2P3 contribution: Video Signal Processing Front End Electronics . .. . CCD Clocks 3 serial 4 parallel 1 reset BackEnd Electronics Back End Module FPGA (1/Raft) Scientific Data 21 Rafts 189 CCD’s 6GB / Frame Clock / DSI Timing / Amplitude SCC CCD 18 bit ADC’s Timing Control Module ASPIC DSI digital 16 outputs 500 X 2K analog -100°C -40°C Warm Electronics Sefri Rachid @LPNHE La Londe-les-Maures october2009

  3. ASPIC: 1rst proto ASPIC: Analog Signal Processing IC • 1rst prototype: mid 2007 to mid 2008 • 2 solutions explored based on ‘Correlated Double Sampling’ • With integrator : Dual Slope Integrator (DSI) • Without integrator : ‘Clamp & Sample’ 4 channels of each on the same silicium substrate to perform crosstalk tests Sefri Rachid @LPNHE La Londe-les-Maures october2009

  4. Vout t reset tfeedthrough Reference level signal level Charge dump ASPIC: 1rst proto Dual Slope Integrator CCD output stage 4 Clocks Clamp & Sample • Requirements: • ~5nV / √Hz • 500KHz Operation freq • .01% Crosstalk • Differential outputs • Output Drive > 50pF • Supply ±2.5V 1 Clock Sefri Rachid @LPNHE La Londe-les-Maures october2009

  5. ASPIC Layout • First proto submited layout • 4 DSI channels • 4 C&S channels • Techno : CMOS 0.35µ 5V • Vendor : AMS • Package : CQFP100 3.8mm 2.7mm Sefri Rachid @LPNHE La Londe-les-Maures october2009

  6. TESTS of ASPIC V1 Sefri Rachid @LPNHE La Londe-les-Maures october2009

  7. COLD TESTS Sefri Rachid @LPNHE La Londe-les-Maures october2009

  8. Power vs Temperature Sefri Rachid @LPNHE La Londe-les-Maures october2009

  9. Offset vs. Temperature Sefri Rachid @LPNHE La Londe-les-Maures october2009

  10. Proto 1 design • The first prototype has demonstrated • Comparison between DSI and C&S in same chip • DSI principle and multi channel IC feasibility at low temperature with low crosstalk • Good fit between simulations and measurements • C&S feasibility Sefri Rachid @LPNHE La Londe-les-Maures october2009

  11. ASPIC: 2nd proto • Technologie : AMS CMOS 0.35µ 5V • 8 Channel full DSI • Package : CQFP100 8 Dual Slope Integrators One ASPIC Channel • 3 input amplifier gains : 2.5 – 5 – 7.5 • to deal with CCD gain spread. • 3 integration time constants : 500ns – 1µs – 1.5µs • to deal with CCD readout frequency. • Idle mode :DC current reduction by a factor of 1.000 baseline : { gain 5 + 500ns integration time} Multi Gain Sefri Rachid @LPNHE La Londe-les-Maures october2009

  12. Warm Test Stand Sefri Rachid @LPNHE La Londe-les-Maures october2009

  13. Linearity Sefri Rachid @LPNHE La Londe-les-Maures october2009

  14. Main Improvement : noise Noise simulations of ASPIC 2 @ -100°C 6µV RMS noise for a Time of Integration of 500ns ASPIC Proto2 Noise simulations and measurements of ASPIC 1 19µV RMS noise for a Time of Integration of 500ns Simulation LPNHE Measurement Sefri Rachid @LPNHE La Londe-les-Maures october2009

  15. Crosstalk measurements @ 300K Reset Signal Signal source -100mV pulse ΔV = Crosstalk Adjacent channel output signal X 10 Sefri Rachid @LPNHE La Londe-les-Maures october2009

  16. LAL/LPNHE Cryostats LAL cryostat dedicated to prototyping tests LPNHE cryostat dedicated to prototyping & pre-prod tests • Already cooled down – used for ASPIC1 Sefri Rachid @LPNHE La Londe-les-Maures october2009

  17. CLASSIC • 8 channels Clamp & Sample chip • Pin to pin compatible with ASPIC 2 • 3 bit programmable gain input amplifier • 4 bit programmable output time constant filter to match the readoutfrequency • Twodifferents C&S topologies • Idle mode Sefri Rachid @LPNHE La Londe-les-Maures october2009

  18. CLASSIC Schematic • New functionalities / ASPIC1: • Switched-capacitor gain • Programmable input gain amplifier • Programmable time constant filter • Two different C&S topologies: • 1st : • One channel noise : 3.9 µV • 18mW/channel and < 1% nonliearity • 2nd • Positive gain channel noise : 2.81 µV • Negative gain channel noise : 2.47µV • 18mW/channel and < 1% nonliearity 18

  19. DSI vs C&S • Signal de sortie d’un CCD = signal de faible niveau: • chaque photo-électron produira quelques µV. • Forme du signal complexe – nécessité d’un timing précis Etage de sortie d’un CCD • Le traitement de l’image doit se faire en lisant le niveau de référence et le signal • La différence de ces signaux donnera le nombre d’électrons du pixel lu • Technique: Correlated DoubleSampling Sefri Rachid @LPNHE La Londe-les-Maures october2009

  20. DSI vs C&S • Dual Slope Integrator • Suppression automatique du bruit de reset des CCD • Utilisé dans SNAP: A low power, wide dynamic range multigain signal processor for the SNAP CCD– JP Walder et Al. – NSS Oct 2004. Sefri Rachid @LPNHE La Londe-les-Maures october2009

  21. DSI vs C&S • Clamp & Sample Switch de clamp • Le bruit CCD en kT/C est « clampé » • Simple – robuste – 1 seule horloge nécessaire – indépendant (jusqu’à une certaine limite!) de la fréquence de lecture du CCD. • - Utilisé pour la lecture des CCD de MegaCam (design du groupe électronique de l’IRFFU) Sefri Rachid @LPNHE La Londe-les-Maures october2009

  22. DSI vs C&S Bruit dominé par le bruit thermique haute fréquencede l’étage d’entrée (pas d’intégration) Bruit • On peut montrer que le bruit: • du DSI est équivalent à • du C&S est équivalent à Bruit dominé par le bruit thermique du CCD (si un étage de gain est placé avant l’intégration) Où en = densité de bruit du CCD, S=gain du CCD, ∆T=temps d’intégration, τ=filtre du C&S Sefri Rachid @LPNHE La Londe-les-Maures october2009

  23. Ampli Bloc Sefri Rachid @LPNHE La Londe-les-Maures october2009

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