T. M. Shaw

QIE10: a new front-end custom integrated circuit for high-rate experiments

We present results on a new version of the QIE (Charge Integrator and Encoder), a custom Application Specific Integrated Circuit (ASIC) designed at Fermilab. Developed specifically for the measurement of charge from photo-detectors in high-rate environments, this most recent addition to the QIE family features 3 fC sensitivity, 17-bits of dynamic range with logarithmic response, a Time-to-Digital Converter (TDC) with sub-nanosecond resolution, and internal charge injection. The device is capable of dead-timeless operation at 40 MHz, making it ideal for calorimetry at the Large hadron Collider (LHC). We present bench measurements and integration studies that characterize the performance, radiation tolerance measurements, and plans for deployment in the Atlas and CMS detectors as part of the Phase 1 and Phase 2 upgrades.

Developments for the upgrade of the CMS HCAL front-end electronics

We present a scheme to upgrade the CMS HCAL front-end electronics in 2015-16. The HCAL upgrade is required to handle a major luminosity increase of LHC which is expected for 2017. This paper focuses on the requirements for the new electronics and on the proposed solutions. The requirements include increased channel count, additional timing capabilities, and additional redundancy in a harsh environment which is constrained by the existing system. The proposed solutions span from chip level to system level. They include the development of a new ADC ASIC, the evaluation and use of circuits from other developments, evaluation of commercial FPGAs, better thermal design and improvements in the overall architecture.