The 23rd and 31st harmonics of a microwave signal generated in a novel THz balanced Schottky diode mixer were used as a frequency stable reference source to phase lock solid-nitrogen-cooled 2.324 and 2.959 THz QCLs. Hertz level frequency stability was achieved, which was maintained for several hours. Steady improvements in THz QCL performance over the last decade [1] has generated considerable ...

A CMOS quadrature down-converter for a direct-conversion receiver of 5.15-5.825GHz wireless LAN is described. The down-converter consists of two sub-harmonic mixers, for I and Q channels, and an LO generation network. In order to prevent the low-frequency component generated by the even-order distortion of the transconductance stage from being leaked to the mixer output, transconductance and sw...

BACKGROUND There is little information on the duration of nasal shedding of EHV-1 from horses with naturally occurring equine herpesvirus myeloencephalopathy (EHM). OBJECTIVES To evaluate the duration of nasal shedding of EHV-1 in horses affected by EHM. ANIMALS One hundred and four horses naturally exposed to EHV-1, 20 of which had clinical signs of EHM. METHODS All horses on affected pr...

This paper reports a novel MMIC balanced sub-harmonic cold FET mixer for MVDS applications using 0.15mm GaAs pHEMT. The mixer, which includes a LO buffer amplifier, was optimized for highly linear upconversion performance in the 42-43.5GHz RF band, 19.520.5GHz LO band and 2.45-3.45 GHz IF band. A dedicated simulation method has been developed to optimize conversion loss and determine optimum ma...

A harmonic mixer for direct-conversion receivers is proposed and fabricated in a CMOS process. It is immune from both the flicker noise and self-mixing induced DC offset. Using the lateral bipolar transistor and the harmonic mixing technique, it achieves +15dB gain, 17.8dB NF at 10kHz frequency, 8.2dBm IIP3, +44dBm IIP2 and more than 30dB DC offset suppression. It consumes 2.2mW power at 3V.

AIM Recently, a relationship between platelets and cancer metastasis has been reported. The aim of this study is to elucidate the risk factors for extrahepatic metastasis (EHM), with emphasis on association with platelets in patients, with hepatocellular carcinoma (HCC). METHODS We examined risk factors for EHM in 1613 consecutive, newly diagnosed HCC patients by logistic regression analysis ...

A 900MHz balanced harmonic mixer for direct conversion receivers is fabricated in a 0.35 μm standard digital CMOS process. The self-mixing-induced DC offset is about 44dB lower than that of the conventional mixer. The inputreferred offset is reduced to the noise level. Specific techniques on flicker noise reduction are also discussed. At 3V power supply and -15.4dBm LO power, it achieves 13 dB ...

An effective technique for mixer LO harmonic rejection in a SAW-less wideband receiver front-end is proposed. The proposed technique provides a tunable notch that can be placed at any frequency like mixer LO harmonics, to avoid the aliasing in baseband after mixing. An analog LC notch is used in a cascode transconductor, and it can reject one of the 3rd or 5th harmonics. T...

Treatment with corticosteroids is an important risk factor for development of invasive aspergillosis. We evaluated the effect of dexamethasone (DEX) on superoxide anion (02) release and damage caused by elutriated human monocytes (EHM) on unopsonized hyphae of Aspergillus fumigatus. In addition, we studied the effects of granulocyte-macrophage colony-stimulating factor (GM-CSF) and interferon-y...