The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Single-array and multiple-array structures were applied to a large-scale planar array for use in uplink space-division multiple access, and their simulated data throughputs were compared. In both structures, a subarray-processing iterative soft-input-soft-output multi-user detector efficiently recovers multi-user signals from multiple RF chains. The phased-array directivity is controlled on the basis...
This paper provides an overview of translational or com-mutated circuits and their role in RF receivers. Insights are offered into the frequency translation of impedances, their modeling, and their application in input matching, blocker rejection, and channel selection. A new front end is also described that rejects blockers at the third harmonic of the local oscillator frequency.
This letter presents the design and fabrication of a 340GHz sub-harmonic mixer (SHM), which mainly includes a pair of anti-parallel planar Schottky diodes fixed onto a quartz-based microstrip circuit chip. At room temperature, the mixer performances were measured in 313GHz-360GHz. Our recent results show that the signal side band (SSB) conversion losses were from 9.78 dB to 12.74dB, and the double...
Accurate displacement estimation can be a challenging task in acoustic radiation force elastography, where signal decorrelation can degrade the ability of a normalized cross-correlation (NCC) estimator to characterize the tissue response. In this work, we describe a Bayesian estimation scheme which models both signal decorrelation and thermal noise, and uses an edge-preserving, generalized Gaussian...
This paper presents a new method for radio frequency interference measurement and locating a single source of increased level of radio frequency interference within the equipment in power stations and substations. The case study demonstrates the advantages and accuracy of the new method.
We experimentally demonstrate the linearity of an analog photonic link employing phase sensitive parametric amplification by performing third order intermodulation distortion product measurements using two RF tones. Amplification without any distortion increase is achieved.
A comparison between two mixer designs is presented in this paper. The electromagnetic performances of fourth-harmonic mixer are compared with the ones of a sub-harmonic mixer both working at an RF frequency of 440 GHz. The best results in terms of noise temperature and conversion loss values are obtained for the sub-harmonic mixer; however, a higher local oscillator frequency is required to pump...
This paper reports on the design and performance of a terahertz (THz) linear camera with 50 pW/√Hz noise-equivalent power (NEP). This camera is sensitive to four bands of vertically and horizontally polarized THz radiation (0.22, 0.32, 0.42, and 0.52 THz). The heart of the camera is a diode-based focal plane array (FPA) that has a 10 nV thermal noise level and 1–2 kV/W sensitivity across the four...
Mixed signal communication networks are used in electromagnetically noisy environment to establish a stable link between local systems. The ability to predict their EMC compliance to standard immunity tests in design phase is required. The paper focuses on an AMS modeling procedure allowing to describe the CAN bus behaviour when affected by disturbances. The network is simulated combining mixed-signal...
Parallel coupled voltage multiplier based accelerator topologies offer advantages of better regulation and ripple compared to their series coupled counterparts for Industrial electron beam accelerators. During conditioning and operation these systems undergoes various types of electrical discharges. The discharge can be a direct spark over from the high voltage terminal to ground through SF6 insulation,...
A Short-wave ultra-wideband balanced amplifier with high linearity and lower noise based on balanced structure is presented. The amplifier is realized by Equilibrium structure, Balun broadband matching, Coupler feedback and Power backoff technology. Equilibrium structure is used to greatly improve the second order distortion and Lossless coupler feedback to reduce the noise. The RF frequency is 1...
An area-efficient and low-power low-noise amplifier with adjustable parameters for bio-potential recording applications is presented. This amplifier replaces traditional analog filters using large AC coupling capacitor with the proposed DC offset suppression block based on Differential Difference Amplifier (DDA) structure, which allows the system to obtain good high pass characterization without using...
This paper presents the design and simulation of High gain Source degenerated Cascode LNA for Wi-max and W-CDMA applications at 3.5GHz. The design uses an enhanced cascade topology to attain improved forward gain and noise figure. Th is design includes lumped elements like inductor, capacitor and resistors to design input and output matching networks. The targeted narrow-band gain, impedance matching...
This paper presents a mathematical model for car-to-car (C2C) visible light communications (VLC) that aims to predict the system performance under different communication geometries. A market-weighted headlamp beam pattern model is employed. We consider both the line-of-sight (LOS) and non-line-of-sight (NLOS) links, and outline the relationship between the communication distance, the system bit error...
A 12-Channal 120-Gb/s optical receiver analog front-end (AFE) design that includes a transimpedance amplifier(TIA) and a limiting amplifier (LA) is demonstrated to require less chip area and is suitable for both low-cost and low-voltage applications. The AFE is stimulation using a 0.18μm CMOS process. In order to avoid off-chip noise interference, the TIA and LA are dc-coupled on the chip instead...
In this paper and its companion paper [16], the problem of cooperative source seeking by a formation of mobile agents is considered. Each agent is equipped with position and signal strength measurement sensors; their task is to find the maximum of the scalar field. Agents exchange information with neighboring agents through a communication network. In the first paper, a distributed gradient estimation...
In this paper and its companion paper [14], the problem of cooperative source seeking by a formation of mobile agents is considered. Each agent is equipped with position and signal strength measurement sensors; their task is to find the maximum of the scalar field. Agents exchange information with neighboring agents through a communication network. In the first part of this couple of papers, a distributed...
We experimentally demonstrate a FDMA-PON system targeting 20 Gbps per wavelength in the upstream, using a real-time FPGA-based transmitter and low-speed baseband DSP, and 39 Gbps in the downstream using a new resources allocation algorithm with 11.5GHz electrical bandwidth, in the framework of the EU research project FABULOUS.
The design, packaging, and characterization of a 70–95 GHz downconverter with 25 GHz of instantaneous bandwidth is presented. The circuit features a novel LO pass-through feature, making it suitable for integration in two-dimensional focal plane arrays with large-N. The chip has been packaged in a waveguide module and, in the packaged configuration, has a noise temperature below 2000 K (9 dB NF) and...
A large number of frequency bands have been included in mobile phone handsets and in their RF front end circuit, RF paths have been increasing and the configuration has been becoming a complex more and more. A new tunable RF front-end circuit for single RF chain architecture is proposed in this paper. A tunable duplexer composed of wideband circulator and SAW based tunable filters for TX and RX, and...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.