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In this work a novel time delay neural network based complex baseband model is proposed for fully digital pulse driven power amplifier concepts. It will be shown that the given technique is able to capture the non-linear effects related to the analog components of the transmitter. Results based on simulations and measurements indicate an accurate modeling performance over a wide frequency range.
A 2.4GHz novel RF Mixer with folded structure designed in 180nm RF-Mixed signal technology has been investigated. It is implemented by using double balanced transconductance switch (GmSw) configuration. The proposed mixer converts incoming signal to small signal RF current followed by PMOS current mirror structure. The circuit is designed and optimized such that it can operate at less than 1.8V of...
Design of tunable multi-band time delay elements based on frequency translation is presented. The proposed topology exhibits time delay of multiple periods of the RF carrier. Two possible implementations of the proposed idea are presented and simulation results are shown for one such implementation. The implemented circuit exhibits an envelope delay of 2.5 ns with the RF carrier delay tunable from...
403-MHz fully differential RF LNA was designed and implemented using 0.13 µm CMOS process. This design was targeted for low-power and low-cost direct conversion applications such as short-range radio in biomedical devices. This design consists of a differential CG-CS LNA with a positive- negative-feedback technique. The LNA occupies 150 µm× 120 µm active chip area, which is approximately 50% of that...
The proposed paper is presented the possibilities for generation of discrete time signals with predefined statistic and frequency parameters, corresponding to the real input or noise signals for analog circuits. A method and program implementation in the MathCAD environment is shown. The signals are statistically modeled by three different autocorrelation types of functions (with predefined dispersion,...
Radio frequency micro- and nanoelectro-mechanical systems (RF MEMS and RF NEMS) and technologies have a great potential to overcome the constraints of conventional IC technologies in realization of fully integrated transceivers of next generation wireless communications systems. During the last two decades a considerable effort has been made to develop RF MEMS/NEMS resonators so that they could replace...
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...
Focal plane arrays (FPAs) find applications in dish-antenna based receivers having multiple wideband beams. Such beams have a plurality of off-axes directions from the main beam. Maximally-decimated multirate 3-D digital FIR frustum filterbank can be employed in an FPA receiver to reduce directional jamming/clutter and other interference, noise, mutual electromagnetic coupling effects, and out-of-system...
This contribution is about the use of software-defined radio (SDR) for channel emulation. Based on NI USRP devices and the LabVIEW programming environment, we devised an affordable RF channel emulator for geostationary satellite transmission. It is able to process 2 × 1.6 MBaud in realtime while adding thermal noise, phase noise and propagation delay according to the system which is modelled. This...
In this paper, the detection/localization of a target based on radio-frequency (RF) and infra-red (IR) data sources problem is addressed. The target is assumed to radiate an RF signal to multiple widely distributed sensors in space and is imaged using multiple frames of an IR sensor. The goal is to integrate RF and IR data to reliably detect and localize the target. The generalized likelihood ratio...
In Smart Mobile Devices, many components are integrated in a small space while each of them is operating at higher frequency ever. In the case of RF components, they are working at a specific single frequency, and it is relatively easy to avoid the interference by allocating the frequency band adequately. However the digital signal which is used in cutting-edge application processor and Multi-Giga...
Isolation of supply noise between disparate circuit blocks is crucial. When powered by the same voltage supply, the switching noise created at the supply node of the digital devices can couple into the power path of the RF circuitry and cause significant performance degradation. Electromagnetic bandgap (EBG) structures, ferrite beads, and split planes are all commonly used to mitigate this problem,...
Power lines that carry communication signals tend to produce radiated electromagnetic interference (EMI). In this paper it is shown how this, usually negative effect, is used for contactless signal transmission. Commercial PLC modems operating in the 150kHz – 30MHz band are used and LAN signals are contactlessly transmitted and received up to 2m.
Advanced CMOS technology assures CMOS device as a good choice for physical realization of RF applications. But as scaling progresses, noise and short channel effect start to deteriorate the device performance, thus increasing the power dissipation. This work focuses on the analysis of thermal noise by varying the gate resistance and frequency. Equivalent noise voltage is calculated for various extracted...
A single-chip UHF RFID reader transceiver for mobile applications has been fabricated in 0.18μm SiGe BiCMOS technology. The chip includes all transceiver blocks as RX/TX RF front-end, RX/TX analog baseband, frequency synthesizer and I2C with fully-compliant China 800/900MHz RFID draft, ISO/IEC 18000-6C protocol and ETSI 302 208-1 local regulation. The receiver in the presence of −3dBm self-jammer...
Envelope tracking (ET) RF power amplifiers are emerging from decades of research as practical approaches for highly efficient, highly linear, broadband power amplification. Many aspects of ET power amplifiers are ideally suited for modern wireless communications - they work well across a wide frequency range, they are amenable to high levels of integration at the mobile terminal level, and they will...
This paper presents a double-balanced down-converter based on a low duty-cycle passive mixer that translates a 18.8 GHz RF signal into a 1 GHz IF signal. The resistive mixer is driven by two analog specially designed pulse generators in order to provide very low conversion losses at high frequencies. The chip has been processed using a 0.13μm BiCMOS technology. With a −1.2dBm input LO power, the overall...
The continuous increase of demand for radios navigators makes the use of Automatic Test Equipments compulsory, in order to reduce the testing time and cost. The Telemakos is an Italian test equipment specifically designed to check radio navigator sensitivities. The paper reports the electromagnetic compatibility analysis carried out to meet the noise specifications. The Telemakos test bench is a very...
Crossed anisotropy amorphous Co85Zr3Nb12 thin film with total magnetic thickness of 2.0 μm is deposited on to the passivation of a bare IC chip to accommodate intra IC chip level digital-to-RF noise suppression and telecommunication performance. On-chip magnetic film processes can be done as the last steps of Si CMOS back end processes. Radiated emission from embedded arbitrary noise generator is...
This paper describes the RF measurement storage and database architecture for long-term continuously running spectrum observatories in the US (at Chicago and Blacksburg) and in Turku, Finland. It also describes how the measurement band plan has been collaboratively created taking into account the specifications and limits of the receiving system. Collecting measurements from different geographical...
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