Two low-power optical data transmission ASICs for the ATLAS Liquid Argon Calorimeter readout upgrade.

Abstract A serializer ASIC and a VCSEL driver ASIC are needed for the ATLAS liquid argon calorimeter readout phase-I upgrade. The baseline ASICs are the serializer LOCx2 and the VCSEL driver LOCld, designed in a 0.25- μ m Silicon-on-Sapphire (SoS) CMOS technology. Based on a 130-nm CMOS technology, we design two pin-to-pin-compatible backup ASICs, LOCx2-130 and LOCld-130. Their power consumptions are much lower then their counterparts. We present the design of LOCx2-130 and LOCld-130. The test results of LOCx2-130 are also presented. Highlights • We present a serializer ASIC, LOCx2-130, and a VCSEL driver ASIC, LOCld-130, for the ATLAS Liquid Argon Calorimeter trigger upgrade. • LOCx2-130 consists of two serializer channels and each channel encodes ADC data and transmits serial data at 4.8 Gbps with a latency of less than 40.7 ns. The power consumption of LOCx2-130 is about 440 mW. • LOCld-130 is a dual-channel VCSEL driver ASIC and each channel works up to 5.12 Gbps. The total power consumption of LOCld-130 is 112 mW (56 mW/channel) including the VCSELs. • Both chips meet the requirements of the ATLAS Liquid Argon Calorimeter trigger upgrade and the power consumptions are much lower than the previous version. [ABSTRACT FROM AUTHOR]