No abstract

The future upgrades of the LHC experiments will increase the beam luminosity leading to a corresponding growth of the amounts of data to be treated by the data acquisition systems. To address these needs, the GBT (Giga-Bit Transceiver optical link [1,2]) architecture was developed to provide the simultaneous transfer of readout data, timing and trigger signals as well as slow control and monitoring data. The GBT-SCA ASIC, part of the GBT chip-set, has the purpose to distribute control and monitoring signals to the on-detector front-end electronics and perform monitoring operations of detector environmental parameters. In order to meet the requirements of different front-end ASICs used in the experiments, it provides various user-configurable interfaces capable to perform simultaneous operations. It is designed employing radiation tolerant design techniques to ensure robustness against SEUs and TID radiation effects and is implemented in a commercial 130 nm CMOS technology. This work presents the GBT-SCA architecture, the ASIC interfaces, the data transfer protocol, and its integration with the GBT optical link.

In the framework of the GigaBit Transceiver project (GBT), a prototype, the GBTSerDes ASIC, was developed, fabricated and tested. To sustain high radiation doses while operating at 4.8Gb/s, the ASIC was fabricated in a commercial 130 nm CMOS technology employing radiation tolerant techniques and circuits. The transceiver serializes-deserializes the data, ReedSolomon encodes and decodes the data and scrambles and descrambles the data for transmission over optical fibre links. This paper describes the GBT-SerDes architecture, and presents the test results.

Abstract-In this work, a comparison has been made between a low noise ring-oscillator and an LC-oscillator Phase Locked Loop (PLL). An ASIC has been developed to conduct irradiation experiments targeting high-energy physics applications. Two different samples were irradiated up to a total ionizing dose (TID) in SiO2 of 200 Mrad and 600 Mrad with a 100• C thermal annealing step. Single-Event Upset (SEU) tests were performed with heavy ions with LETs (Linear Energy Transfer) between 3.2 and 69.2 MeV.cm 2 /mg. A Two-photon absorption (TPA) laser facility has been used to provide detailed results on the SEU sensitivity. Both independent PLLs have identical loop dynamics to allow a fair comparison including a Triple-Modular Redundant (TMR) divider and TMR phase detector. Furthermore these circuits consume the same amount of power. The PLLs were processed in a commercial 65 nm CMOS technology.