We investigate the three-wave mixing process that is induced by nonlinear envelope pulse collisions in composite right- and left-handed transmission lines with regularly spaced Schottky varactors. For left-handed waves, the wave number decreases as the frequency increases; this results in the resonant interaction of colliding left- and right-moving waves. In this study, we introduce design criteria for the generation efficiency of sum frequency waves using the derivative expansion method; we also introduce a method of generating pulsed second-harmonic waves.
The results of a full-wave analysis of the performances of ADS-based thinned arrays of wire dipoles are presented. The pattern features of the ADS layouts are numerically evaluated by considering different aperture sizes, lattice spacings, and dipole lengths. The outcomes are that, despite a slight and expected performance worsening, the a-priori PSL bounds deduced for the “ideal” case still provide useful guidelines for the design of ADS thinned layouts featuring real dipole elements.
This paper is aimed at presenting a new time-domain imaging technique that combines the regularization properties of the Filtered FBTS method with an efficient information-acquisition strategy, namely the Iterative Multi-Scaling Approach (IMSA). The proposed time-domain approach is then validated by means of a set of preliminary numerical test cases aimed at pointing out its features and potentialities, as well.
An InGaAs metal-semiconductor-metal (MSM) photodetector (PD) monolithically integrated with an InP photonic-wire waveguide has been demonstrated by using III-V CMOS photonics platform. Owing to a Schottky contact between Ni and p-InGaAs, the MSM PD operation is obtained with a dark current of 270 nA at 1 V bias voltage. The 20-µm-long waveguide InGaAs PD exhibits responsivity of around 0.4 A/W and broadband operation covering the C- and L-bands, enabling wavelength division multiplexing (WDM) optical interconnects.
BiNbOx (BNO) thin films fabricated by a chemical solution deposition (CSD) under annealing conditions of 550°C and 20 min were found to exhibit an unprecedentedly high relative dielectric constant of 170, which is substantially greater than that of sputtered BNO films. Transmission electron microscopy analysis showed that the BNO film fabricated by CSD had two crysalline phases, β-BiNbO4, cubic pyrochlore, along with amorphous regions. In contrast, the BNO film deposited by sputtering consists of Bi3NbO7 crystallites and amorphous regions and no cubic pyrochlore phase was found. The presence of the pyrochlore crystallites explains unprecedentedly high relative dielectric constant observed in CSD-derived BNO films.
The technology of three-dimensional (3D) SoCs is emerging as a promising approach for extending Moore’s Law. Managing test architecture design and optimization of 3D integration are crucial challenges. In this paper, we propose a reconfigured test architecture optimization for 3D SoCs, including a novel scheme to minimize the pre-bond test time and Known-Good Stack (KGS) test to guarantee the yield of 3D SoCs. Experimental results on ITC’02 SoC benchmark circuits show that our scheme reduces the total test time by around 23% on average and nearly 30% in maximum compared with one baseline solution.