A radiation-hard dual-channel 12-bit 40 MS/s ADC prototype for the ATLAS liquid argon calorimeter readout electronics upgrade at the CERN LHC

摘要

The readout electronics upgrade for the ATLAS Liquid Argon Calorimeters atthe CERN Large Hadron Collider requires a radiation-hard ADC. The design of aradiation-hard dual-channel 12-bit 40 MS/s pipeline ADC for this use ispresented. The design consists of two pipeline A/D channels each with fourMultiplying Digital-to-Analog Converters followed by 8-bitSuccessive-Approximation-Register analog-to-digital converters. The customdesign, fabricated in a commercial 130 nm CMOS process, shows a performance of67.9 dB SNDR at 10 MHz for a single channel at 40 MS/s, with a latency of 87.5ns (to first bit read out), while its total power consumption is 50 mW/channel.The chip uses two power supply voltages: 1.2 and 2.5 V. The sensitivity tosingle event effects during irradiation is measured and determined to meet thesystem requirements.