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Silicon RF power amplifiers (PAs) are in various RF front end modules (FEMs) today for handset and WLAN applications. Even though III-V semiconductor-based RF PAs can still offer superior frequency and breakdown performance with higher Pout and power-added-efficiency (PAE) and faster time-to-market, silicon-based RF PAs do have the advantages in offering higher monolithic integration with added functionalities...
Co-time and co-frequency full-duplex (CCFD) is an effective technology with promising application prospect in improving the spectrum efficiency for wireless communication. However, it was viewed as impossible not too long ago for its sever self-interference. In this work, a novel intermediate frequency self-interference suppression solution with a symmetrical reconstruction path is proposed, based...
In this paper, a thick TSV interposer with integrated inductor, micro-strip and coplanar waveguides(CPW) transmission lines on high resistivity Si substrate is presented for 2.5 D integration of RF devices. The electrical interconnection through Si interposer is realized by two individual pieces of holly Cu TSVs of different diameters assembled at the axis. Metallization is realized with a redistribution...
In this paper, the technology of through silicon via (TSV) is applied to radio frequency (RF) receiver module. A grounded coplanar waveguide (GCPW) with TSV is proposed, through the simulation, and the improvement of TSV on RF transmission performance is studied, including TSV's aperture size, density, arrangement and so on. This paper also studies basic components model such as resistance, capacitance...
Technology scaling along with unprecedented levels of device integration has led to increasing numbers of analog/mixed-signal/RF design bugs escaping into silicon. Such bugs are manifested under specific system-on-chip (SoC) operating conditions and their effects are difficult to predict a-priori. This paper describes recent advances in detecting and diagnosing such bugs using "guided" stochastic...
Phoxonic crystals are periodic nanostructures that are simultaneously photonic and phononic crystals. Phoxonic cavities can trap visible or near infrared light and Gigahertz phonons in the same tiny volume, while phoxonic waveguides can confine their propagation to a tiny solid core, in both cases possibly promoting their interaction. This paper reviews various phoxonic nanostructures that have been...
In this paper, a contiguous carrier aggregation scheme for the downlink transmissions in an inband full-duplex cellular network is analyzed. In particular, we consider a scenario where the base station transmits over a wider bandwidth than the mobiles, while both parties are still using the same center frequency. As a result, the mobiles must cancel their own self-interference over a wider bandwidth,...
Autocorrelation principles are applied to the problem of line source radiation. Consequently, the radiated power can be determined directly from the current distribution without a priori knowledge of the radiated pattern. A summary of the methodology is presented along with results previously obtained for the cosine and uniform distributions. The methodology is then applied to the cosine-on-a-pedestal...
Although non-functional requirements (NFR) are the basis for the definition of a appropriate architecture to the software context and have influence on the time and cost of development, elicitation of the requirements still seems to be a problem for many organizations. The objective of this study is to identify the current situation of the organizations as the NFR elicitation. We conducted a survey...
The formation and growth of silicon nanoparticles (SiNPs) (diameter < 5 nm) in plasmas is being investigated due to many potential applications, including biomedical devices, renewable energy, and photovoltaics. Although experimental synthesis of SiNPs has had success in optimizing the process, the formation mechanisms are not yet fully understood. We have developed a two dimensional numerical...
In this paper, we study joint design of linear hybrid precoding and equalization for full-duplex (FD) massive multiple-input multiple-output (MIMO) systems such that the sum mean squared error is minimized across all mobile stations. To better resolve practical issues such as hardware complexity, power consumption, and overhead of channel estimation, hybrid processing, which consists of digital processing...
Reconfiguration of connections along frequency axis, — similar to frequency hopping in wireless systems, has been shown to improving security in elastic optical networks (EONs). However, the effect of spectrum reallocation on the connections' blocking and the associated connections' security is still under-explored. In this paper, we examine the effect of reconfiguration of connections on its security...
Hydrogen is an element of significant interest for semiconductor process; however it cannot be detected by many available elemental analysis techniques. Secondary ion mass spectrometry (SIMS) is one of the few techniques for the measurement of hydrogen amount and depth distribution. Among all kinds of SIMS tools, magnetic sector, quadrupole and time-of-flight, quadrupole SIMS instrument usually has...
GNSS time transfer is widely used for remote clock comparisons, in particular by the BIPM for UTC/TAI. Comparing clocks with this technique requires a calibration of the GNSS reception chain (between the antenna phase center and the reference clock). CNES has been working extensively on the absolute calibration of GNSS reception chains for many years. This paper presents the recent improvements and...
We report the first observation of mode splitting in a standalone microelectromechanical resonator resulting from the coupling from a mechanical mode to intrinsic localized modes. The demonstration of this coupling mechanism in a microstructure finds its relevance in both fundamental studies including explorations of phonodynamics and applications exploiting energy localization or delocalization by...
A simulation methodology dealing with the complexity of multiphysical micro electro mechanical system (MEMS) models and their evaluation according to RF specification is presented. It is focused towards the evaluation of a hybrid MEMS-CMOS RF oscillator prior to its realization, based on the demodulation performance of a long-term evolution (LTE) user equipment (UE). The proposed multiphysical simulation...
We experimentally demonstrate a broadband microwave photonics phase shifter. This phase shifter utilizes the free-carrier dispersion effect in a silicon microring resonator (MRR) with P-N junction. We characterize the phase and amplitude response of the MRR at different bias voltage. Experimental results show that a microwave photonics phase shifter with a bandwidth from 10 GHz to 15 GHz and a tuning...
The emerging trend in wireless communication devices have shaped the requirement of micro-devices having the inimitable capability of operating in the radio frequency (RF) range. RF MEMS switches have brought about a revolution in the volatile area of nanotechnology, due to its exceptional and extensive switching capability. The focus of this research is the analysis and redesign of contact type radio...
Direct-conversion radio transceivers can offer reprogrammable and low-cost hardware solutions for full-duplex (FD) cognitive radio (CR) devices. However, they are susceptible to radio frequency (RF) impairments, such as in-phase (I) and quadrature (Q) imbalance (IQI), which can significantly constrain the spectrum sensing capabilities. This paper is devoted to quantify and evaluate the effects of...
In practical implementations of single-antenna full-duplex (FD) radios, the imperfect isolation between the transmit (TX) and receive (RX) ports of the circulator causes the leakage of a strong self-interference (SI) component. This issue reduces both the spectral and energy efficiency of the device. State-of-the-art SI cancellation (SIC) solutions mitigate this problem, however they also constrain...
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