The NECTAR0 Chip Irfu: F. Guilloux, E.Delagnes LPSC: D. Dzahini, F. Rarbi Un. Barcelona: D. Gascon, A. Sanuy. LPNHE LPTA Montpellier

Nectar: New Electronics for the Cerenkov Telescope ARray Goal: perform the readout of the photodetectors of the telescopes of the future CTA. CTA: “convergence” of the HESS, Magic and probably Veritas communities ~ 100 telescopes of 3 different geometries, with ~1000 pixel camera Very high background => need for very fast camera (<10ns integration time required ). Electronics located at the focal plane of the telescope: need for high dynamic range low power, integrated electronics Performance of fast analogue memories perfectly matches with the requirements: ARS0 => HESS, SAM => HESS-2. Nectar: Same concept + integrated ADC => ANR grant. HESS(2) Namibia Magic: Canary islands

Use of Analogue memory on NECTAR. Used as a circular buffer with area of interest readout ~“Cut & Paste” of the SAM analogue memory (2 differential channels) Extended to 1024 cells/ ch (instead of 256) to deal with longer trigger latency

(High Slew Rate/low power Amp) NECTAR0 block diagram Collaboration with Barcelona Univ. (High Slew Rate/low power Amp) 12-bit ADC (IP from LPSC)

Integration of the ADC IP. Use of an IP block designed by IN2P3/LPSC shared between 2 channels. See “A low power 12-bit and 25-MS/s pipelined ADC for the ILC / Ecal integrated readout”, F. Rarbi, D. Dzahini, L. Gallin-Martel”, 2008, IEEE NSS. Preferred to Wilkinson architecture originally proposed for simplicity of use. Good performances reported, power pulsing available. Quasi-static use possible. Practically: Full “flat” layout provided by LPSC. “coded” netlist, for simulation (no schematic). Use of the IP not so obvious & required more time than foreseen. Simulations made using extracted view from DIVA. Were absolutely necessary for checking (timing, ranges,…) Direct contact with LPSC (very available) was necessary . Full chip DRC/LVS with ASSURA in macro mode: quite tricky to use. Solution found only few days before submission.

Nectar 0 chip Submission CMOS AMS 0.35µm technology: 3x7mm chip. TQFP 128 (0.4mm pitch) package. Submitted in an engineering run common with IPHC Return expected in end of June 2010. Tests will take place in the “new” labs of Jussieu. Digital LVDS SCA Input buffers ADC RO + MUX