The design of 8-Gbps VCSEL drivers for ATLAS liquid Argon calorimeter upgrade

Liang, Futian; Gong, D. T.; Hou, S.; Liu, T; Liu, C; Su, D.; Teng, P. K.; Xiang, Annie C.; Ye, J; Jin, G.

doi:10.1088/1748-0221/8/01/c01031

Cited by 10 publications

(10 citation statements)

References 4 publications

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“…LOCx2 is a dual 8 × 12 bit serializer, with 5.12 Gbps of output [5]. LOCld is a VCSEL (Vertical Cavity Surface-Emitting Lasers) driver, designed for the optical interface [6]. Both are fabricated with 250 nm Silicon-on-Sapphire CMOS technology and have been irradiated up to 200 kRad.…”

Section: Lar Front-end (Fe) Electronicsmentioning

confidence: 99%

Phase-I Trigger Readout Electronics Upgrade for the ATLAS Liquid-Argon Calorimeters

Camplani

2018

Springer Proceedings in Physics

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The upgrade of the Large Hadron Collider scheduled for the Long Shutdown period of 2019-2020, referred to as Phase-I upgrade, will increase the instantaneous luminosity to about three times the design value. Since the current ATLAS trigger system does not allow sufficient increase of the trigger rate, an improvement of the trigger system is required. The Liquid Argon (LAr) Calorimeter read-out will therefore be modified to use digital trigger signals with a higher spatial granularity in order to improve the identification efficiencies of electrons, photons, tau, jets and missing energy, at high background rejection rates at the Level-1 trigger.

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Section: Lar Front-end (Fe) Electronicsmentioning

confidence: 99%

Phase-I Trigger Readout Electronics Upgrade for the ATLAS Liquid-Argon Calorimeters

Camplani

2018

Springer Proceedings in Physics

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“…A radiation-tolerant VCSEL driver is needed in the MTx. A single-channel 8-Gbps VCSEL driver prototype, called LOCld1, has been developed and tested [10][11].…”

Section: The Laser Driver Asicmentioning

confidence: 99%

Component Prototypes Towards a Low-Latency, Small-Form-Factor Optical Link for the ATLAS Liquid Argon Calorimeter Phase-I Trigger Upgrade

Deng

Chen

et al. 2015

IEEE Trans. Nucl. Sci.

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This paper presents several component prototypes towards a low-latency, small-form-factor optical link designed for the ATLAS Liquid Argon Calorimeter Phase-I trigger upgrade. A prototype of the custom-made dual-channel optical transmitter module, the Miniature optical Transmitter (MTx), with separate transmitter optical sub-assemblies (TOSAs) has been demonstrated at data rates up to 8 Gbps per channel. A Vertical-Cavity Surface-Emitting Laser (VCSEL) driver ASIC has been developed and is used in the current MTx prototypes. A serializer ASIC prototype, operating at up to 8 Gbps per channel, has been designed and tested. A low-latency, low-overhead encoder ASIC prototype has been designed and tested. The latency of the whole link, including the transmitter latency and the receiver latency but not the latency of the fiber, is estimated to be less than 57.9 ns. The size of the MTx is 45 mm × 15 mm × 6 mm. I. INTRODUCTION arge Hadron Collider (LHC) detectors, including the ATLAS Liquid Argon Calorimeter (LAr), widely use optical links to transmit detector data from the front-end detectors to the back-Manuscript received November 15, 2013.

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“…1(a), and easily get Eq. (1) and (2). During the calculation, we can cancel the V gs4 which voltage crosses the C gs4 , and get the equivalent impedance Z L as shown in Eq.…”

Section: Design Of Active Shunt Peakingmentioning

confidence: 99%

“…The active inductor shunt peaking is the main method to achieve the data rate with the process we use. For other design details, please refer to our related work [2]. The shunt-peaking techniques are widely used to extend the bandwidth.…”

Section: Design Of Active Shunt Peakingmentioning

confidence: 99%

Active inductor shunt peaking in high-speed VCSEL driver design

Liang¹,

Gong²,

Hou³

et al. 2013

Chinese Phys. C

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An all transistor active inductor shunt peaking structure has been used in a prototype of 8-Gbps highspeed VCSEL driver which is designed for the optical link in ATLAS liquid Argon calorimeter upgrade. The VCSEL driver is fabricated in a commercial 0.25-µm Silicon-on-Sapphire (SoS) CMOS process for radiation tolerant purpose. The all transistor active inductor shunt peaking is used to overcome the bandwidth limitation from the CMOS process. The peaking structure has the same peaking effect as the passive one, but takes a small area, does not need linear resistors and can overcome the process variation by adjust the peaking strength via an external control. The design has been tapped out, and the prototype has been proofed by the preliminary electrical test results and bit error ratio test results. The driver achieves 8-Gbps data rate as simulated with the peaking. We present the all transistor active inductor shunt peaking structure, simulation and test results in this paper.

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The design of 8-Gbps VCSEL drivers for ATLAS liquid Argon calorimeter upgrade

Cited by 10 publications

References 4 publications

Phase-I Trigger Readout Electronics Upgrade for the ATLAS Liquid-Argon Calorimeters

Phase-I Trigger Readout Electronics Upgrade for the ATLAS Liquid-Argon Calorimeters

Component Prototypes Towards a Low-Latency, Small-Form-Factor Optical Link for the ATLAS Liquid Argon Calorimeter Phase-I Trigger Upgrade

Active inductor shunt peaking in high-speed VCSEL driver design

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