Abstract
The development of front-end systems for the ATLAS tracker at the sLHC is now in progress and the availability of radiation tolerant buck converter ASICs enables the implementation of DC to DC converter based powering schemes. The front-end systems powered in this manner will be exposed to the radiated and conducted noise emitted by the converters. The electromagnetic compatibility between DC to DC converters and ATLAS short strip tracker hybrid prototypes has been studied with specific susceptibility tests. Different DC to DC converter prototypes have been designed following a noise optimization methodology to match the noise requirements of these front-end systems. The DC to DC converter developed in this manner presents a negligible emission of noise that was confirmed by system tests on an ATLAS tracker front-end module prototype. As a result of this, power converters can now be integrated in close vicinity of front-end chips without compromising their overall noise performance.
Highlights
The development of front-end systems for the ATLAS tracker at the sLHC is in progress and the availability of radiation tolerant buck converter ASICs enables the implementation of DC to DC converter based powering schemes
Several hybrid and detector modules are mounted together to form a stave or a supermodule [4, 5]. Based on this and on the estimated power requirements of the hybrids, an optimal powering scheme based on DC-DC converters has been proposed for ATLAS [2], that relies on an input voltage bus (10V) distributed along the stave to all the hybrids
Each hybrid circuit would be equipped with one Buck DC/DC converter delivering an intermediate bus voltage (2.5V) that brings the power to each front-end chip with a conversion efficiency of 80%
Summary
Different DC to DC conversion technologies applicable to the trackers at sLHC have been studied in detail. A 0.35 μm technology was fully qualified and ASIC prototypes have been designed and produced, the latest one being the AMIS2 ASIC [9] It integrates the full control loop, the bandgap reference voltage generation, and a relatively simple. The resulting compact geometry was found to be favorable to reduce the magnetic field emissions; placed on top of the converter ASIC the board area is minimized. The manufacturability of this coil is a critical issue and recent contacts with industry resulted in the development of a custom compact air core toroidal inductor of 200 nH that matches the converters requirements (figure 2). Copper foils of 200 μm thickness have been successfully used for handmade shield assemblies; the copper coating of molded plastic structures is under study for a manufacturable and low mass shielding solution
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
