In the modern high-performance transceivers, mixers (both upand down-converters) are required to have large dynamic range in order to meet the system specifications. The lower end of the dynamic range is indicated by the noise floor which tells how small a signal may be processed while the high end is determined by the non-linearity which causes distortion, compression and saturation of the sig...

We model and verify noise in analog/RF designs using an automated theorem prover. We model the designs using stochastic differential equations (SDE), due to the statistical nature of noise. We find a closed form solution for the SDEs based on stochastic calculus, and then verify properties using the MetiTarski theorem prover. Our approach is illustrated on an RL High-Pass Filter and a Sample-an...

Structural parameter identifiability is a property of differential model with parameters that allows for the to be determined from equations in absence noise. One standard approaches assessing this problem via input–output and, particular, characteristic sets ideals. The precise relation between and subtle. goal note clarify relation. main results are: We expect some these facts may known exper...

A superconducting hot-electron bolometer mixer receiver operating from 1 to 1.26 THz has been developed. This heterodyne receiver employs two solid-state local oscillators each consisting of a Gunn oscillator followed by two stages of varactor frequency multiplication. The measured receiver noise temperature is 1350K at 1.035 THz and 2700K at 1.26 THz. This receiver demonstrates that tunable so...

We have measured the frequency dependent IF impedance and mixer conversion gain of a small area NbN hot-electron bolometer (HEB). The device used is a twin slot antenna coupled NbN HEB mixer with a bridge area of 1 μm x 0.15 μm, and a critical temperature of 8.3 K. In the experiment the local oscillator (LO) frequency was 1.300 THz, and the intermediate frequency (IF) 0.05-10 GHz. We find that ...

This paper investigates the transient behavior of a novel design an industrial mixer incorporating additional work head movement. In contrast to conventional models, this consists elastic torsion bar with its longitudinal axis oriented orthogonally main drive shaft axis. Using hang workhead adds degree freedom, greatly improving mixing fluids or powders. The motion electro-mechanical device was...

To improve the understanding of how static mixers work and how to better utilize them in environmental engineering ~or, specifically, drinking water treatment!, a numerical model for simulating turbulent flows in helical static mixers is developed. The model solves the three-dimensional, Reynolds-averaged Navier-Stokes equations, closed with the k-v turbulence model, using a second-orderaccurat...

In this article, the temperature behavior of output power of superluminescent light-emitting diode (SLED) by considering the effect of non-radiative recombination coefficient, non-radiative spontaneous emission coefficient and Auger recombination coefficients has been investigated. For this aim, GaN pyramidal quantum dots were used as the active region. The numerical method has been used to sol...

The purpose of this study was to explore the complex flow structure a novel active-type micromixer that based on concept of Wankle-type rotor. The characteristics of this micromixer are two folds; a rapid mixing of reagents in a limited space due to the generation of multiple vortices and a graduate increment in dynamic pressure as the mixed reagents is delivered to the output ports. Present mi...