We demonstrate the phase locking of a 2.7 THz metal-metal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier chain (x12) from a microwave synthesizer at approximately 15 GHz. Both laser and reference radiations are ...

The flicker noise mechanism under switching conditions is studied. Experimental results show that the baseband flicker noise is a superposition of upconverted gate flicker noise at each harmonic of the output current. Methods to reduce the flicker noise are discussed. Based on the measured results, the large signal flicker noise model for RF applications under switching conditions is proposed a...

In this paper we discuss the stability of heterodyne terahertz receivers based on small volume NbN phonon cooled hot electron bolometers HEBs . The stability of these receivers can be broken down in two parts: the intrinsic stability of the HEB mixer and the stability of the local oscillator LO signal injection scheme. Measurements show that the HEB mixer stability is limited by gain fluctuatio...

Abstract:Today, one of the important issues of power quality (PQ) in power systems is the current harmonics. Increasing expansion of nonlinear loads at different parts of the electric network makes harmonic distortion flow through the network. This causes the network to have background voltage and current harmonic distortion and even affect on the PQ of linear load performance. Therefore, it is...

In this paper, the design of a waveguide fixtuned 220GHz subharmonically pumped mixer using Schottky planar diodes is demonstrated. It is supposed to be applied in an experimental short-range and high-speed communication system. The anti-parallel pair of planar Schottky diodes from the Rutherford Appleton Laboratory (RAL) was flip-chip mounted and soldered onto a suspended 75μm-thick quartz mic...

In this paper, a simple but effective method for compensation of the quadrature error in MEMS vibratory gyroscope is provided. The proposed method does not require any change in the sensor structure, or additional circuit in the feedback path. The mathematical relations of the proposed feedback readout system were analyzed and the proposed solution assures good rejection capabilities. Based on ...

Equine herpesvirus myeloencephalitis (EHM) remains one of the most devastating manifestations of equine herpesvirus type 1 (EHV-1) infection but our understanding of its pathogenesis remains rudimentary, partly because of a lack of adequate experimental models. EHV-1 infection of the ocular vasculature may offer an alternative model as EHV-1-induced chorioretinopathy appears to occur in a signi...

Adapted filamentous pathogens such as the oomycetes Hyaloperonospora arabidopsidis (Hpa) and Phytophthora infestans (Pi) project specialized hyphae, the haustoria, inside living host cells for the suppression of host defence and acquisition of nutrients. Accommodation of haustoria requires reorganization of the host cell and the biogenesis of a novel host cell membrane, the extrahaustorial memb...

Despite guideline recommendations, access to hepatitis C virus (HCV) treatment is frequently restricted, with some payers approving therapy for only those with advanced disease or cirrhosis. However, delaying potentially curative treatment until the development of advanced liver disease may have costly consequences in terms of both hepatic complications and extrahepatic manifestations (EHMs) of...