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The closed loop hall effect current sensor is a popular current sensor because of its high bandwidth, ac and dc measurement, isolation. But the prime demerit of it is high power consumption at high currents. This is because of the losses in the linear power amplifier driving the compensating winding current. In this paper, a novel closed loop hall effect current sensor involving a Class D Amplifier...
In wireless sensor networks, the need for ultra- low power consuming nodes is one of the main motivations for research in such field. Because radio sections in sensor nodes contribute to a large extent to the overall power consumption, the focus of this study is on the RF transceiver. The aim is to reduce the average power consumption which depends significantly on the circuit architecture design,...
This paper presents the design of the front-end circuitry of a low power and low noise analog biopotential signal acquisition system. The design has been optimized for low power consumption while still achieving the gain, bandwidth and input referred noise required by this application. The design consists of three main building circuit blocks. The first stage is the instrumentation amplifier which...
Internet of things (IoT) benefits from fast and low cost development of technology portable re-configurable hardware. Low power consumption is desired for applications operating from harvested or limited energy. Subthreshold operation of VCO-based ADCs is investigated in this work in order to meet these challenges. A ring VCO built using NAND gates is used for reliable operation in the subthreshold...
This paper presents a novel inductorless transimpedance amplifier (TIA) design using Global Foundaries 0.18-µm CMOS technology suitable for high speed optical communication. A modified-RGC preamplifier stage (M-RGC) is used to lower input impedance through cascode and parallel PMOS transistor techniques for wideband operation. The amplifier stage used common source amplifiers to increase the gain...
Nowadays, data centers deploy a large number of servers and network devices to provide various service functions (e.g. firewalls, deep packet inspection, content caches, WAN optimizers, etc.) and sufficient network connection. Most traffic in data centers is subject to treatment by multiple service functions (SFs) which form an ordered service function chain (SFC). In this paper, we study the energy-aware...
This paper investigates spectrum-power trading between a small cell (SC) and a macro-cell (MC), where the SC consumes power to serve the macro-cell users (MUs) in exchange for some bandwidth from the MC. Our goal is to maximize the system energy efficiency (EE) of the SC while guaranteeing the quality of service (QoS) of each MU as well as small cell users(SUs). Specifically, given the minimum data...
This paper presents a fully differential high-resolution analog interface circuit to apply in an inertial navigation system. By integrating an anti-aliasing filter and a second order sigma-delta modulator into a single chip, the interface circuit can achieve high-resolution with low power consumption. The prototype fabricated in a 0.25 µm CMOS process achieves a dynamic range (DR) of 94 dB, a SNDR...
In this paper, we will explore and develop an embedded real time system and associated algorithms that enable an aggregation of limited resource, low-quality, projectionenabled mobile devices to collaboratively produce a higher quality video stream for a superior viewing experience. Such a resource aggregation across multiple projector enabled devices can lead to a per unit resource savings while...
We introduce a new approach to measure spin waves on-chip and describe the design of an ultra-wideband Low-Noise Amplifier (LNA) implemented in a readout circuitry for characterization of the spin wave devices. The LNA shows a gain of 22.6 dB in the frequency range between 9.7 GHz and 43.3 GHz. The minimum Noise Figure (NF) is 5.3 dB at 22.75 GHz. Simulations were performed with 65 nm CMOS technology...
We describe a reach-adaptive auxiliary graph based dynamic connection grooming scheme for elastic optical networks using multiple transmission options available with bandwidth variable transponders. We study different job scheduling methods and their impact on energy efficiency. The proposed scheme also incorporates efficient regenerator usage to improve the energy efficiency.
Aiming at improving the energy efficiency of 3D-stacked memory subsystems, this paper proposes a power-aware last level cache (LLC) control mechanism. The proposed mechanism switches enabling/disabling the LLC according to application characteristics and the power efficiency of the memory subsystems. Evaluation results show that the proposed mechanism improves the power efficiency of 3D-stacked memory...
Analog-to-information converters and Compressed Sampling (CS) sensor front-ends try to only extract the relevant, information-bearing elements of an incoming data stream. Information extraction and recognition tasks can run directly on the compressed data stream without needing full signal reconstruction. The accuracy of the extracted information or classification is strongly determined by the front-end...
This paper presents a novel technique to extend the bandwidth of oversampled Analog-to-Digital Converters (ADCs) when clock frequency cannot be increased and oversampling has to be preserved. The Signal Transfer Function (STF) of the converter is modified to boost the signal in the extended band. The modification keeps the noise transfer function (NTF) unaffected, and therefore, there is no need of...
This paper presents an ADC with programmability between SAR-only mode and delta-sigma (ΔΣ) assisted mode. The ΔΣ assisted mode brings 1st order noise shaping for resolution enhancement. Proposed charge shuttling technique makes it possible to share a charge re-distribution capacitor array for DAC in SAR, feedback DAC, and integrator capacitor in ΔΣ loop and improve the accuracy. The prototype ADC...
The IEEE 802.3az standard, known as Energy Efficient Ethernet (EEE), is one of recent efforts to improve energy efficiency in communications. However, EEE may not achieve good energy efficiency on some traffic patterns. Coalescing techniques were proposed to solve this problem, but their implementations typically employ a simple polity and need further optimization. Adaptive interrupt coalescing (AIC)...
An ultra wideband (UWB) noise-cancelling low-noise amplifier (NCLNA) is proposed in this paper. A common-gate input stage with an input matching network is implemented to make input resistance matching to 50-ohm. The power consumption of the presented NCLNA can be lower by using current-reuse architecture. A noise cancelling technique is adopted to decrease the noise generated by the first common-gate...
In this paper, we propose a Virtual Machine (VM) allocator for Cloud Computing Data Center (DC). We allocate a set of VMs on servers that are interconnected through a three-tier fat-tree network topology. VMs require four different resources: CPU, memory, disk, and bi-directional network bandwidth forcommunications directed to and coming from the external gateway. Our goal is not to overload computing...
This paper quantifies the difference in resource demand between modern and classic NoC workloads. In the paper, we show that modern workloads are able to better utilize higher numbers of VCs and smaller C factors in order to attain performance and energy efficiency. This is because of the high throughput and possible local congestions in their traffic pattern. As a result, such workloads are more...
This paper represents an ultra-wide band low noise amplifier (LNA) that stands out for it high degree of simplicity, small size, extremely low power consumption and impressive broadband performance. Smart choice of topology, device scaling and Active Impedance Matching Technique enabled a good broadband matching off the amplifier. The measured performance featuring 10.2 dB transducer gain with -3...
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