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This paper presents a power-efficient single-loop continuous-time (CT) third-order sigma delta (ΔΣ) modulator that achieves a SNDR of 79.6 dB over a 10 MHz signal bandwidth. The modulator uses a feedforward-feedback (CIFF-FB) architecture which incorporates a single amplifier biquad (SAB) and a passive integrator to realize a third-order noise shaping. We also propose a continuous-time complementary...
Multipath TCP (MPTCP) has gained great attention by the researchers and network application developers due to its features providing better bandwidth utilization and higher reliability recently. Utilizing MPTCP in the datacenters provides performance gain to the applications. If the underlying network has Software Defined Networking (SDN) architecture, the routing of the MPTCP subflows can be specialized...
This paper proposes the reconfigurable RX analog baseband transformer that supports multi-standard applications. The proposed ABB can transform its structure between a delta-sigma modulated ADC for narrow band and a baseband LPF for wide band with a simple switch configuration without extra cost. Thus, the ABB obtains efficiency in both size and power aspects. It occupies only 0.11mm2 of active area...
Modern SOCs may be composed of hundreds of individual physical modules, referred to as tiles. The total number of scan channels servicing these tiles often greatly exceeds the number of SOC device pins available to connect those channels to test equipment. Traditional reliance on a small number of pin-to-channel test mode configurations, predetermined in hardware, results in inefficient scan data...
Inductor current in the high speed switching converters is used as a feedback signal for current mode control and over current fault protection. Sensing inductor current for the use of digital controllers require high bandwidth current sensors and also need high speed Analog to Digital Converter (ADC) to convert the sensed current into digital domain. Use of high bandwidth current sensors and high...
Envelope Tracking (ET) Technique can remarkably improve the efficiency of the power amplifier (PA) in the modern Mobile Communication Base Station. Switch-Linear Hybrid (SLH) ET power supply has become the mainstream structure, which gives consideration to high efficiency and high bandwidth. However, the SLH ET power supply with single switching converter suffers a low efficiency as increasing the...
Based on the dynamic behavior of IGBT and diode, this paper proposed an experimental method for extracting stray inductance of bus bars without high bandwidth current measurement. The experiment is implemented by a double pulse test of the 4.5kV/3000A HVIGBTs. The stray inductance extraction results of several methods were analyzed and compared, verifying the accuracy of the proposed method.
Aalborg Inverter is a kind of high efficient Buck-Boost inverter. Since it may work in “Buck-Boost” mode, the control bandwidth should be high enough to ensure a good performance under any grid condition. However, during the “Boost” operation, the control bandwidth depends much on the grid impedance if the crossover frequency is traditionally chosen lower than the characteristic frequency of system...
This work proposes a control linearization technique for a single phase 3 level-flying capacitor multi-level (FCML) inverter with multiple modulation strategies along the line period, based on the plant inversion. Multiple modulation strategies are used along the line cycle so that the overall size and efficiency of the converter are optimized. This benefit from the point of view of the energy processing...
This work deals with class-G, i.e. discrete level, supply modulated systems. It is investigated how the efficiency improvement achievable through this approach depends on the maximum switching frequency of the modulator. As could be expected for high modulation bandwidths a fast class-G modulator is desirable in order to achieve maximum efficiency enhancement. However, for class-G, contrary to continuous...
Multi-cloud promises to substantially improve faulttolerance, by tolerating disasters affecting a subset of providers. Unfortunately, multi-cloud solutions are premature and none of them are fully fledged. Their main impediment is the lack of network services: to date, it remains impossible for a customer to setup and control a multi-cloud network. Moreover, manually inter-connecting multiple clouds...
While the bandwidth and latency improvement of both WiFi and cellular data networks in the past decade are plenty evident, the extent of signal strength fluctuation and network disruptions (unexpected switching or disconnections) experienced by mobile users in today's network deployment remains less clear. This paper makes three contributions. First, we conduct the first extensive measurement of network...
ECN thresholds have limited operational range and very strict scope. Lower thresholds exacerbate the queue underflow while higher thresholds increase the queueing delays. In this paper, an Adaptive ECN (A-ECN) marking scheme is proposed to enhance the performance of ECN. A-ECN can adaptively adjust ECN marking thresholds in different scenarios to achieve good generality. Therefore, network operators...
The reactive model of Software Defined Networking (SDN) invokes controller to dynamically determine the behaviors of a new flow without any pre-knowledge in the data plane. However, the reactive events raised by such flexible model meanwhile consume lots of the bottleneck resources of the fast memory in switch and bandwidth between controller and switches. To address this problem, we propose SoftRing...
This paper presents the design and test of 2×2 channel emulator, which is especially optimized for LTE-Hi testing. It adopts traditional convention method of the channel impulse response in time domain. The design features lower memory resource with sharing delay data buffering, which could reduce the cost of efficient VLSI Implement. In addition, Bidirectional design offers flexible and reliable...
Bufferless, deflection-routed, Butterfly Fat Trees (BFTs) can outperform state-of-the-art FPGAs overlay NoCs such as Hoplite by as much as 2–5× on throughput and ≈5× on worst-case latency at identical PE counts, and by ≈1.5× on throughput at identical resource costs >16K LUTs for statistical traffic patterns. In this paper, we show how to modify the tree connectivity and routing function to support...
Among the high-radix and low-diameter networks, fat-tree topology is commonly used in HPC and datacenter systems. Resource and job management is critically important to mitigate application interference in order to achieve high system performance and utilization. Preliminary studies have shown the effect of job placement on parallel scientific applications performance. In this work we study interference...
Comparison of most mature and promising emerging memory technologies respect to mainstream NAND and DRAM and challenges for the introduction in the market for high density applications.
In this work, we seek to gain an understanding of the InfiniBand network processing limitations that might exist in gathering performance metric information from InfiniBand switches using our new LDMS ibfabric sampler. The limitations studied consist of delays in gathering InfiniBand metric information from a specific switch device due to the switch's processor response delays or RDMA contention for...
Wide Band Gap (WBG) transistors using materials such as Gallium Nitride (GaN) and Silicon Carbide (SiC) offer superior electrical and thermal properties, as well as fast switching capability. However, the high dv/dt and high di/dt may cause ringing with the parasitic inductances and capacitances in the switching loop, increasing overshoot voltages and reducing confidence in the design. Also, making...
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