A low-latency, low-overhead encoder for data transmission in the ATLAS Liquid Argon Calorimeter trigger upgrade

Xiao, Le; Li, Xiaoting; Gong, D. T.; Chen, Jinghong; Deng, Bangming; Fan, Qingjun; Feng, Yulang; Guo, D.; He, Hao; Hou, S.; Liu, Chonghan; Liu, Tiankuan; Sun, X.; Tang, Yuxuan; Teng, P. K.; Vosooghi, Bozorgmehr; Xiang, Annie C.; Ye, Jingbo; You, Yuan; Zuo, Zhiheng

doi:10.1016/j.nima.2016.03.067

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Each LOCx2 transmits the data from four quad-analog-channel ASIC ADC chips [13] or two octal-analog-channel ASIC ADC chips (Texas Instruments, Part number ADS5272 or ADS5294) [14]. The encoder implements a custom line code [15]. Each serializer takes the digitized data of eight analog signals.…”

Section: Results Of Mtx/mtrx Qc Testmentioning

confidence: 99%

Quality control tests of the front-end optical link components for the ATLAS Liquid Argon Calorimeter Phase-1 upgrade

Deng¹,

Thomas²,

Zhang³

et al. 2021

J. Inst.

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We present the procedures and results of the quality control tests for the front-end optical link components in the ATLAS Liquid Argon Calorimeter Phase-1 upgrade. The components include a Vertical-Cavity Surface-Emitting Laser (VCSEL) driver ASIC LOCld, custom optical transmitter/transceiver modules MTx/MTRx, and a transmitter ASIC LOCx2. LOCld, MTx, and LOCx2 each contain two channels with the same structure, while MTRx has a transmitter channel and a receiver channel. Each channel is tested at 5.12 Gbps. A total of 5341 LOCld chips, 3275 MTx modules, 797 MTRx modules, and 3198 LOCx2 chips are qualified. The yields are 73.9%, 98.0%, 98.4%, and 61.9% for LOCld, LOCx2, MTx, and MTRx, respectively.

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Section: Results Of Mtx/mtrx Qc Testmentioning

confidence: 99%

Quality control tests of the front-end optical link components for the ATLAS Liquid Argon Calorimeter Phase-1 upgrade

Deng¹,

Thomas²,

Zhang³

et al. 2021

J. Inst.

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“…The two LOCx2 5.12 Gbps serializer channels share one high-speed clock system based on an inductor-capacitor (LC) oscillator PLL. They -13 -use a low-overhead custom encoding and framing transmission protocol (LOCic [29]) developed to meet the requirement of transmission latency, and to achieve automatic link re-synchronization should the receiving end of the link fail to recognize the transmission frame due to single event upset (SEU) in the link Front-End. The encoding protocol can detect up to three consecutive SEU errors, enabling the link Back-End to discard data containing SEU errors.…”

Section: Serializer and Optical Transmittermentioning

confidence: 99%

The Phase-I trigger readout electronics upgrade of the ATLAS Liquid Argon calorimeters

Aad

Akimov²,

Khoury³

et al. 2022

J. Inst.

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The Phase-I trigger readout electronics upgrade of the ATLAS Liquid Argon calorimeters enhances the physics reach of the experiment during the upcoming operation at increasing Large Hadron Collider luminosities. The new system, installed during the second Large Hadron Collider Long Shutdown, increases the trigger readout granularity by up to a factor of ten as well as its precision and range. Consequently, the background rejection at trigger level is improved through enhanced filtering algorithms utilizing the additional information for topological discrimination of electromagnetic and hadronic shower shapes. This paper presents the final designs of the new electronic elements, their custom electronic devices, the procedures used to validate their proper functioning, and the performance achieved during the commissioning of this system.

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“…The input data of each channel of LOCx2-130 come from two Nevis ADCs, one ADS5272, or one ADS5294. LOCx2-130 implements a custom line code called LOCic [16]. The output frame definition of the LOCx2-130 is shown in Figure 6.…”

Section: Design Of Locx2-130mentioning

confidence: 99%

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

Xiao

Zhou

Sun

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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A serializer ASIC and a VCSEL driver ASIC are needed for the front-end optical data transmission in 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-µm Siliconon-Sapphire (SoS) CMOS technology and consumed 843 mW and 320 mW, respectively. 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 of their counterparts, whereas other performance, such as the latency, data rate, and radiation tolerance, meet the phase-I upgrade requirements. We present the design of LOCx2-130 and LOCld-130. The test results of LOCx2-130 are also presented.

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A low-latency, low-overhead encoder for data transmission in the ATLAS Liquid Argon Calorimeter trigger upgrade

Cited by 4 publications

References 7 publications

Quality control tests of the front-end optical link components for the ATLAS Liquid Argon Calorimeter Phase-1 upgrade

Quality control tests of the front-end optical link components for the ATLAS Liquid Argon Calorimeter Phase-1 upgrade

The Phase-I trigger readout electronics upgrade of the ATLAS Liquid Argon calorimeters

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

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