This paper presents an improved linearity variable-gain amplifier (VGA) in 0.18-µm CMOS technology. The lineari­ty improvement is resulted from employing a new combinational technique, which utilizes third-order-intermodulation (IM3) cancellation mechanism using second-order-intermodul­ation (­IM2) injection, and intermodulation distortion (IMD) sinking techniques. The proposed VGA gain cell co...

A complete procedure for the design of W-band low noise amplifier in MMIC technology is presented. The design is based on a simultaneously power and noise matched technique. For implementing the method, scalable bilateral transistor model parameters should be first extracted. The model is also used for transmission line utilized in the amplifier circuit. In the presented method, input/output ma...

BACKGROUND Investigations were conducted by the authors to explore an outbreak of viral hemorrhagic fever (VHF) reported in 2010 from Al-Mukalla city, the capital of Hadramout in Yemen. METHODS From 15-17 June 2010, the outbreak investigation period, specimens were obtained within 7 days after onset of illness of 18 acutely ill patients hospitalized with VHF and 15 household asymptomatic cont...

Global Lightning and sprIte MeasurementS (GLIMS) mission is now ongoing on Exposed Facility of Japanese Experiment Module (JEM-EF) of the International Space Station (ISS). This paper focuses on an electromagnetic (EM) payload of JEM-GLIMS mission, very high frequency (VHF) broadband digital InTerFerometer (VITF). JEM-GLIMS mission is designed to conduct comprehensive observations with both EM ...

Recently, Low noise amplifier versatile used in modern wireless communication like Wi-Max, WLAN, GSM, Bluetooth and satellite communication. Low Noise amplifier have important feature like amplify the signal with rejection of noise. Low noise amplifier in modern communication used as filter with amplifier. In recent scenario low noise amplifier available in wide band, single band, multi-band fr...

Empirical propagation loss models play a crucial role in wireless communication system with their cost-effectiveness and simplicity. In this letter, we present mathematical characterization of the Federal Communication Commission (FCC) F(50,50) curve for Very High Frequency (VHF) Ultra (UHF) band. The proposed empirical model is based on novel step-wise fitting FCC signal strength data. intende...

Introduction The hippocampus (HF) is known to be involved in episodic memory and this brain region has increasingly been linked to drug-seeking behaviour in rodent behavioral models of substance abuse. Cocaine is a drug of abuse that can alter the magnitude of long-term potentiation (LTP) in the CA1 region of the HF (1). LTP is a form of synaptic plasticity that is thought to underlie learning/...

Arenaviruses such as Lassa fever virus (LASV) and lymphocytic choriomeningitis virus (LCMV) are benign in their natural reservoir hosts, and can occasionally cause severe viral hemorrhagic fever (VHF) in non-human primates and in human beings. LCMV is considerably more benign for human beings than Lassa virus, however certain strains, like the LCMV-WE strain, can cause severe disease when the v...

We derive total components lengths based on the characteristics and angular locations of the VHF radiation detected by an interferometer. The method differentiates between negative leaders and fast negative processes and applies simple relationships from the physics of lightning to deduce the channel lengths of these components for both intra-cloud and cloud-to-ground lightning flashes. The stu...

Modern concepts of operations for multinational operations within NATO and partners require air-interface interoperability for VHF and UHF tactical communications. This contrasts with the historical approach to interoperability of using wired gateways at the higher network levels. As a result of the historical trends, national combat-net radios (CNR) have been procured from industry conforming ...