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This paper presents a new method for ring amplifier biasing to improve their stability while maintaining high slew rate. A multi-path ring amplifier is proposed for switched capacitor applications that allows accurate charge transfer at high speeds. Dynamic biasing improves large signal slewing without affecting residue amplifier settling performance. Stable operation is possible because the auxiliary...
The task to switch on 100 lights together seems rather easy, but it gets rather difficult when using established TCP/IP transport through bandwidth-restricted controls-RF connections: A convenient “time-to-light” after pushing a button should stay below 0.2 seconds. Without any optimization, the control may easily take more than 10 seconds before the action is completed. This paper addresses the timing...
Many different types of applications simultaneously execute in current data centers (DCs). To provide low cost and improved performance, each application is typically deployed in distributed DCs. Tasks of users around the world first go through Internet service providers (ISPs) which deliver data between distributed DCs and users. However, capacities and bandwidth cost of different ISPs vary. Besides,...
With Network Function Virtualization (NFV), network functions are deployed as modular software components on the commodity hardware, and can be further chained to provide services, offering much greater flexibility and lower cost of the service deployment for the network operators. At the same time, replacing the network functions implemented in purpose built hardware with software modules poses a...
Datacenter network always needs to be updated so that it can adapt to frequent traffic changes and constantly achieve high network utilization. However, the quality of service can be easily reduced by unexpected transient link congestion, which may be caused by variable link transmission latency during flow migration. Furthermore, when network administrators reallocate bandwidth resource without taking...
In software defined networks, control plane is decoupled from data plane and is directly programmable. Network controller retrieves an integrated view of data plane and thus an End-to-End (E2E) QoS guarantee is easier to realize than classic network paradigms. Deterministic Network Calculus (DNC) is a network analysis tool to provide a deterministic delay or bandwidth bound. In this proposal, an E2E...
Software-Defined Networking (SDN) is an emerging architecture and offers advantages over traditional network architecture, while there exist some scalability challenges. In this paper, we propose a multicast routing algorithm for SDN with segment routing to serve the bandwidth requirement of a multicast routing request. Our algorithm considers the balance of traffic load for network resource of link...
A reconfigurable radiation pattern antenna is constructed using half-wave dipole antenna. Metal cylinders with pin diodes are added around the dipole antenna acted as reflector and cause the change in radiation pattern for particular direction. The reconfigurable antenna works up to 32 directions with minimum beam separation of 10°.
This paper proposed a new wide-bandwidth hybrid supply modulator for LTE-A power amplifier. The proposed wide-bandwidth hybrid supply modulator is for long term evolution (LTE)-advanced power amplifier. This proposed modulator uses simple linear amplifier structure to achieve 100MHz tracking speed. This proposed modulator proposes a bandwidth control to improve the efficiency of the supply modulator...
Among the low-diameter, high-radix networks beingdeployed in next-generation HPC systems, dual-rail fat-treenetworks are a promising approach. Adding additional injectionconnections (rails) to one or more network planes allows multirailfat-tree networks to alleviate communication bottlenecks. These multi-rail networks necessitate new design considerations, such as routing choices, job placements,...
High-radix routers with low latency and high bandwidth play an increasingly important role in the design of large-scale interconnection networks such as those used in super-computers and datacenters. The tile-based crossbar approach partitions a single large crossbar into many small tiles and can considerably reduce the complexity of arbitration while providing throughput higher than the conventional...
Big data and machine learning applications are posing steadily increasing challenges to the used compute platforms in terms of performance and energy efficiency. In this paper we utilize the highly scalable heterogeneous server platform RECS for evaluation of a wide variety of hardware platforms ranging from general purpose CPUs via ARM-based SoCs to GPGPUs and FPGAs. The self-organizing map, a popular...
Comparison of the dominant emerging memory technologies at the fundamental cell level will be presented. Metrics will be discussed and the technologies will be compared with the objective of judging the suitability for high density memory applications.
Multipath TCP(MPTCP) is an experimental protocol under standardization in the IETF. It enables hosts to send data over several interfaces or paths and has use cases on smartphones, datacenters or dual-stack hosts. It has proven to increase bandwidth in these cases while remaining compatible with the existing network infrastructure and applications. However, with the popularity of Online Data-Intensive...
When multiple virtual machines (VMs) are running on the same physical device, inner-VM switching and VM's bandwidth allocation are usually achieved by hypervisor, without any NIC support. Although there have been several optimization algorithms for hypervisor, these software-based methods still can't be optimal solutions because of extra CPU workloads. Motivated by the studies, we proposed a VM-friendly...
We design a novel DRAM controller that bundles and executes memory requests of hard real-time applications in consecutive rounds based on their type to reduce read/write switching delay. At the same time, our controller provides a configurable, guaranteed bandwidth for soft real-time requests. We show that there is a fundamental trade-off between the latency guarantee for hard real-time requests and...
A 0.5–3GHz true-time delay (TTD) phase shifter circuit is implemented. Basing on active delay cells and active switches, the coarse delay is achieved. The LC artificial transmission line (ATL) provides continuous delay. The delay variation of the total delay is less than 2.4%. Using broadband matching and shunt peaking techniques, larger bandwidth and flatter group delay is obtained in phase shifter...
This paper presents a novel technique to design a programmable bandwidth single-ended output CMOS operational amplifier using a serial digital interface. The circuit topology enables the programming of the value of a negative Miller capacitance around first amplification stage and programming of the value of a Miller capacitance around the second amplification stage. Therefore, a controllable frequency...
This paper proposes an application-aware multipath flow routing framework that integrates Machine Learning Techniques (MLT) in Software Defined Networks (SDN). Applications generated by the devices are diverse in nature, for each application bandwidth and delay requirements vary. The flows in the network compete for a constrained resource such as bandwidth or low latency path, an intelligent flow...
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