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This paper presents a signal-reused technique for distributed amplifier (DA) by using feedback transformers between the cascaded gain stages. With a proper coupling coefficient (k) of the feedback transformer, the gain-bandwidth (GBW) product of DA can be improved by extending the bandwidth of DA while maintaining the same average gain without increasing the power consumption. The DA is realized by...
In this paper, a blind bandwidth extension algorithm for music signals has been proposed. This method applies the K-means algorithm to firstly cluster audio data in the feature space, and constructs multiple envelope predictors for each cluster accordingly using Support Vector Regression (SVR). A set of well-established audio features for Music Information Retrieval (MIR) has been used to characterize...
In recent years, the demand for memory performance has grown rapidly due to the increasing number of cores on a single CPU, along with the integration of graphics processing units and other accelerators. Caching has been a very effective way to relieve bandwidth demand and to reduce average memory latency. As shown by the cache feature table in Fig. 23.9.1, there is a big latency gap between SRAM...
The defected-ground-structure (DGS) resonator is an important topic of design of the front-end circuit in the wireless communication systems. By etching a patterned slot in the ground plane, it can excite band-stop frequency performance [1, 2]. Generally, the conventional DGS resonator with two shorted ends and its resonated path in its fundamental mode is half a wavelength long at the operated frequency...
Presented is a novel half Gb DRAM device for 3D stacked systems utilizing TSV. It is designed through the use of a new computer-aided design methodology and which realizes 819 Gb/s bandwidth across 16 channels and <10ns read latency on a 45nm DRAM process. The architecture is based on small subarrays with short WL and BL to realize the low latency and energy efficiency. We also integrated several...
Video streaming over the wireless mobile network suffers from signal fading and shadowing effects. For instance, when the train is moving in a fixed route over the railway, the signal will vary along the moving route, especially on some specific positions, e.g., tunnels and underground. This serious signal variation results in packets loss and affects the video presentation quality. Furthermore, if...
As an alternative of parabolic reflectors, microstrip reflectarrays inherit their many merits as well as those of conventional antenna arrays. This work is focused on solving the problem of terahertz (THz) beam scanning by reflectarrays. The proposed reflectarray is demonstrated based on novel single-layered elements with a linear phase delay and multi-frequency phase-matching method. An operating...
More and more researches have demonstrated the benefits of cognitive radio technology in improving flexibility and efficiency of spectrum utilization. In order to encourage primary users (PUs) to share their idle spectrum resources with secondary users (SUs), spectrum trading frameworks are developed. In this paper, the investment problem of spectrum service provider (SSP) is considered which obtains...
A configurable multi-band GNSS RF receiver with wide bandwidth in a heterodyne radio topology is implemented for Compass/GPS/Galileo applications in a 0.35μm SiGe BiC-MOS process. The receiver adopts a Σ − Δ fractional-N PLL to generate different local oscillator (LO) signals and down-converts GNSS signals in L1/B1/B2/B3/L1C/E1/E1b, c bands to an identical intermediate frequency (IF) of 46MHz. By...
Based on IEEE 802.15.4, a contention-free period (CFP) adopts guarantee time slot (GTS) mechanism to ensure each device can access the radio channel. However, it is hard to get the authority to access the radio channel due to more competitors access the radio channel simultaneously. To cope with this issue, we proposed a guarantee time slot mechanism to enhance the performance and utilization of using...
To preserve the frame error rate (FER) of multimedia applications in the polling-based HCCA of 802.11e/a WLAN is important especially under low signal-to-noise ratio (SNR) conditions. MAC frame retransmission is an effective technique to reduce the FER, especially when there has no better modulation and coding scheme (MCS) can be selected. The Surplus Bandwidth Allowance (SBA) field in the Traffic...
The multi-domain virtual environment is an important research area of the distributed virtual reality. However, frequent interaction, great quantity of messages and the discrepant need of each individual simulation domain resulted in numerous redundant messages. In this paper, we propose a Publish/Subscribe based correlative matching method for multi-domain virtual environment. This method focus on...
Voltage scaling is one of the most effective mechanisms to improve microprocessors' energy efficiency. However, processors cannot operate reliably below a minimum voltage, Vccmin, since hardware structures may fail. Cell failures in large memory arrays (e.g., caches) typically determine Vccmin for the whole processor. We observe that most cache lines exhibit zero or one failures at low voltages. However,...
Online Social Networks (OSNs) are more and more popular recently, people may through them interact with each other for the purpose of social intercourse. The client/server OSN architecture brings about the bottleneck of bandwidth and computation. It leads to the scalability problem and the communication latency increases as users grows. This paper proposes a bandwidth- and latency-aware peer-to-peer...
The data exchange capacity among each processing units was a key factor in performance of multiprocessor parallel system. Parallel interconnection based on master-slave architecture constrained by several factors could not be further increased bandwidth. However, high-speed serial interconnect based on point-to-point architecture could achieve greater bandwidth. This paper presented a new multi-processor...
A low-voltage low-power high-efficiency squarer circuit used as energy collector for 3.1-5 GHz non-coherent UWB applications. The squarer circuit is based on flipped voltage follower circuit, whose bandwidth is extended higher than 5 GHz by choosing device length and bias current properly. The proposed squarer circuit is implemented in 65 nm CMOS process and the transistor level circuit simulation...
In order to store massive image data in real-time system, a high performance Serial Advanced Technology Attachment (SATA) controller is proposed in this paper. RocketIO GTX transceiver realizes physical layer of SATA protocol. Link layer and transport layers are implemented in VHDL with programmable logic resources. Application layer is developed on POWERPC440 embedded in Xilinx Virtex-5 FPGA. The...
An 8 Gbps automatic gain control (AGC) loop for PAM receiver is proposed. Incorporating digital intensive gain control scheme, the dynamic range of the variable gain amplifier is 22 dB with a resolution of 0.9 dB/step. The locking time of the AGC loop is less than 200 ns and independent of input amplitude. Fabricated in a 0.18 ??m CMOS technology, the chip size is 0.62 mm ?? 0.62 mm. The total power...
This paper proposes a dual-band circular polarization (CP) monopole antenna. This antenna can generate a broadband impedance-bandwidth from 2.17 to 8.47 GHz, and excite a left-hand circular polarization (LHCP) at 2.48 GHz and right-hand circular polarization (RHCP) at 3.90 GHz. The measured 3-dB axial ratio (AR) bandwidths are about 140 MHz from 2.41 to 2.55 GHz approximately 5.6% with respect to...
A microstrip-fed loop-like antenna designs with circular polarization (CP) is presented in this paper. The proposed loop-like antenna comprised of a monopole antenna, a sleeve strip connected with the ground plane and an L-shaped slit embedded in the ground plane. The C-like monopole generates a resonant mode for wideband impedance-bandwidth at the GPS and DCS bands, and the sleeve and the slit are...
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