CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Gigatracker Front end based on ultra fast NINO circuit P. Jarron, G. Anelli, F. Anghinolfi, M. Despeisse, S. Tiuraniemi, S. Poundjou

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Architecture of the front end Best timing performance done with a fast shaping –Minimize time walk –Minimize jitter if noise not too high Feasible with small input capacitance 300 fF The challenge is to find the best configuration –NINO configuration used for ALICE TOF Scaled down to match 300fF input C Following by a discriminator stage –Pulse width encodes the input charge –Efficient for time walk correction, like TOT

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Nino 0.25  m for ALICE TOF Design and test results

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting NINO electronic readout Developed for the Time Of Flight (TOF) detector of ALICE experiment Readout of Multigap Resistive Plate Chambers (MRPC) - Differential input (differential signal provided by MRPC) - Optimized to operate with 10 pF input capacitance - Amplifier with ~ 1 ns peaking time - Threshold adjustable in the range fC Picture of NINO ASIC Chip is 2 × 4 mm channels per chip Implemented in a 0.25  m CMOS technology - Low power consumption (40 mW/channel) - Time resolution measured down to ~ 5ps rms

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Measurement set up Pulse generator : 0.8 ns or 1.6 ns leading edge Electrical characterization w. pulse generator : Differential or single ended mode Differential input Single ended mode I in + Q = C ×  V For  V = 10 mV : Q = 10 fC 100 mV 100 fC I in - Differential probe + - Differential output readout : NINO

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Simulation Simulation of Electrical characterization w. pulse generator : single ended mode Voltage rising edge, 0.8 ns or 1.6 ns, 20 mV or 100 mV NINO output Pulse width varies w. input charge and input current shape Time walk varies w. input charge Time walk varies w. input current shape 0.8 ns rising edge 1.6 ns rising edge

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Electrical characterization Electrical characterization w. pulse generator : single ended mode Voltage rising edge of 0.8 ns or 1.6 ns Threshold : 30 mV Rising edge : 0.8 ns / 100 mV Input Charge : 100 fC Differential output : 500 mV level Superposition of 5000 signals Trigger from pulse generator Diff. Output Pulse width Time walk Time jitter Characterization of : - Pulse width - Incertitude on pulse width - Time walk - Time jitter

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Electrical characterization Threshold at 45 mV – 0.8 ns rising edge Average of 456 signals Pulse width variations ns rising edge 1.6 ns rising edge Resolution is varied by the threshold value T and by the current signal shape 1 ns peaking time

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Electrical characterization Time walk 0.8 ns rising edge 1.6 ns rising edge 0.8 ns rising edge 1.6 ns rising edge Measurements for T = 30 mV, 45 mV, 60 mV and 75 mV Time walk correction can be done by measuring pulse width

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Electrical characterization Time jitter 0.8 ns rising edge 1.6 ns rising edge 20 ps Jitter varies w. input charge, threshold and w. input current shape: Faster is the signal lower is the time jitter T = 45 mV

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Nino 0.13  m for P326 Design and simulation results

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Input circuit configuration Common gate differential input stage

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Overall circuit block diagram Ultra fast circuit based on cascaded stages –Entirely differential from input to output

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Main characteristics of the front end Total time walk : 0.75 ns-1ns fast in; 1ns-1.5 ns, slow in Time walk variation 2-10 fC: 250 ps/fast in, 500ps /slow in Jitter calculated: 80ps rms, signal 10 4 e-, rise time 1 ns Rise time of the input amplifier: 1ns ENC for fast input (400ps) – 600 e- rms ENC for slow input, planar silicon operating at Vsat – 700 e- rms Power consumption is – ~ 300 µW 1.2 V DD Supply current – 250 µA Drain current of each input branch – 15 µA Drain current of each differential stage – 15 µA There are 5 differential stage and one driver.

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Output, walk for fast detector Charges input 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 fC, Walk 0.75 ns -1 ns for 2 to 10 fC Pulse width encodes input charge ns

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Output and walk for slow detector Charges input 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 fC, Walk 1 to 1.5 ns for 2 to 10 fC Pulse width encodes input charge ns

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting Preamplifier and post stages Preamplifier –So far there is no preamplifier Lack of time –First understand if the discriminator stage itself is sensitive enough for MIP Digital post stages –Gate delay digital filter signals with pulse width Help to decrease threshold Can be used to correct time walk

CERN PH MIC group P. Jarron 07 November 06 GIGATRACKER Meeting News 130 nm Submission with Turin 27 November External users interested with Gigatracker technology – Time resolved X-ray fluorescence spectroscopy ESRF, DESY, SPRING8 Pixel APD technology for ultra fast X-ray detection –Discussion under way to understand how to profit from this interest A junior fellow has been asked to PH for P326 electronics