1. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 1 An MWPC Readout Chip for High Rate Environment Introduction ASIC Structure & Fabrication ASIC Evaluation A VME based MWPC Readout System Summary Chikara Fukunaga at Tokyo Metropolitan Univ. on behalf of the ATLAS TGC electronics group

2. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 2 Introduction Construction of General-purpose MWPC readout system with customized ASIC Primary goal is for a test system of ATLAS Thin Gap Chambers (TGC)  High rate  Large scale and huge amount of read out channels  Binary readout

3. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 3 ASIC system 1 – Readout Block One channel readout Binary input from ASD LVDS to TTL Polarity control Synchronization 100 stage shift registers pipeline for trigger latency Most of blocks are built from standard cells

4. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 4 ASIC system 2 – Timing Charts (working principle) Hit channel No hit channel

5. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 5 ASIC system 3 – an LVDS cell A Standard diff. to single ended signal converter Differential Amp. Two inverters Drivable to 200 MHz frequency 33  m

6. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 6 ASIC mask pattern ROHM CMOS 0.6  m Die size 4.5 x 4.5 mm 2 8000 Gates Full-custom Package QFP160 LVDS block isolated from Main Digital block

7. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 7 ASIC evaluation Current dissipation vs. driving frequency (V DD =5V) 25 MHz LVDS pulse input Up to 200 MHz the ASIC works normally. Driving voltage:LVDS input For both 5 and 3.3V, Input range of LVDS covers standard one of 0 and 2.4 V.

8. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 8 MWPC readout system with ASIC VME based system Special J2 backplane Components VME crate + special J2 ASD (Amp.+Shaper+Discl.) A Control Signal Distributor (CSD) Signal Latch (SL) modules VME controller + PC

9. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 9 ASD board (Amp.,Shaper,Discriminator) For ATLAS TGC to readout wires/strips in binary mode High background High radiation 4 ASD chips (16 ch.) (4 ch./chip) Stable operation for up to 100 KHz

10. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 10 CSD (Control Signal Distributor) and SL (Signal Latch) CSD Distribution of  Control signals of DAQ (CLK,TRIGGER,Gate width,Reset) for SLs  Event ID numbers for SLs  Threshold volt., test pulse for ASDs via SL SL Operation of 4 ASICs (64 channels) Latch signals with TRIGGER Input  ASD binary data (Front Panel for 4 ASD boards)  CLK,TRIGGER etc.(J2) Output  64 channels hit pattern (FIFO and J1) +3.3V for ASD

11. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 11 Evaluation of an SL (ASIC & COTS) Two versions of SL COTS (64 channels) ASIC (64 -> 128 channels)

12. 20/Oct./2000 CF IEEE NSS 2000 at Lyon,France 12 Summary ASIC for MWPC readout system has been made. Shift register pipeline for high rate environment V DD of ASIC can be down to 3.3 V Frequency up to 200 MHz VME based MWPC has been constructed with ASIC Power,Cost,Size are downed to 1/2 This system will be used for the ATLAS TGC test bench.