Wei-Hung Chen

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This paper presents a broadband very low 3<sup>rd</sup> -order intermodulation inductor-less low-noise amplifier (LNA) implemented in 0.13 mum CMOS technology. The LNA consists of a common-gate input stage for wideband impedance matching, followed by two parallel common source amplifiers which perform noise and distortion cancellation. Third-order(More)
Cerebral white matter undergoes various changes with normal aging. This study investigated the association between age, gender, and the global and regional fractional anisotropy (FA) and mean diffusivity (MD) in 145 adults (30 to 80 years old) using diffusion tensor magnetic resonance imaging. We studied sixteen regions of interest in both hemispheres to(More)
Diffusion tensor imaging (DTI) has already proven to be a valuable tool when investigating both global and regional microstructural white matter (WM) brain changes in the human aging process. Although subject to many criticisms, voxel-based analysis is currently one of the most common and preferred approaches in such DTI aging studies. In this context,(More)
This paper presents an integrated quadrature demodulator with on-chip frequency divider implemented in a 0.13 mum CMOS technology. The mixer consists of a transconductance stage, a passive current switching stage, and an operational amplifier output stage. A complementary input architecture has been used to increase the transconductance for a given bias(More)
BACKGROUND AND PURPOSE The association between anticardiolipin antibody (aCL) and ischemic stroke is controversial, and there are few case-control studies of Asian populations. The aim of this study, therefore, was to determine whether aCL is an independent risk factor for ischemic stroke in Taiwanese patients over the age of 40 years. METHODS Both the(More)
To evaluate the optimal session of double filtration plasmapheresis (DFP) in terms of the maximal clearance rates for various serum substances, the laboratory parameters of 152 consecutive patients treated with different sessions of DFP following a standard protocol on an alternate-day basis was studied. Immunoglobulin M (IgM) and lipoprotein cholesterol(More)
This is a case report of a 32-year-old woman with chronic severe anemia who developed headaches and seizures 5 days after receiving a blood transfusion of eight units (1600 ml) of packed red blood cells. Magnetic resonance imaging indicated vasogenic edematous lesions bilaterally over the occipital lobes that were consistent with reversible posterior(More)
This paper presents a wideband receiver front-end implemented in 0.13 &#x00B5;m CMOS technology. The front-end consists of a low-noise amplifier (LNA), a quadrature mixer, and a frequency divider. Multi-gated transistors have been used to enable linearity tuning. The circuit employs no inductors and operates from 0.3 &#x2212; 2.6 GHz with a tunable baseband(More)
OBJECTIVE The common concurrence of migraine and chronic fatigue syndrome (CFS) has been reported but whether migraine poses a higher risk of CFS remains unknown. In this retrospective case-control study, we examined the association between the 2 disorders by using a nationwide, population-based database in Taiwan. METHODS The data were retrieved and(More)