Agilent Technologies

About: Agilent Technologies is a company organization based out in Santa Clara, California, United States. It is known for research contribution in the topics: Signal & Mass spectrometry. The organization has 7398 authors who have published 11518 publications receiving 262410 citations. The organization is also known as: Agilent Technologies, Inc..

Design of Wide Tuning-Range CMOS VCOs Using Switched Coupled-Inductors

Abstract: Two designs of voltage-controlled oscillators (VCOs) with mutually coupled and switched inductors are presented in this paper to demonstrate that the tuning range of an LC VCO can be improved with only a small increase in phase noise and die area in a standard digital CMOS process. Particular attention is given to the layout of the inductors to maintain Q across the tuning range. In addition, different capacitive coarse-tuning methods are compared based on simulated and measured data obtained from test structures. Implemented in a 90 nm digital CMOS process, a VCO with two extra coupled inductors achieves a 61.9% tuning range with an 11.75 GHz center frequency while dissipating 7.7 mW from a 1.2 V supply. This VCO has a measured phase noise of -106 dBc/Hz at 1 MHz offset from the center frequency resulting in a higher figure-of-merit than other recently published VCOs with similar operating frequencies. In addition, the area overhead is only 30% compared to a conventional LC VCO with a single inductor.

Temperature compensation of film bulk acoustic resonator devices

Abstract: A resonator. The resonator includes a bottom electrode overlaying at least part of a substrate, a composite structure overlaying at least part of the bottom electrode, and a top electrode overlaying at least part of the composite structure. The composite structure comprises a piezoelectric layer and a compensation layer, and the compensation layer includes silicon dioxide combined with boron.

Physiological fluid extraction with rapid analysis

Abstract: A device for sampling and analyzing a physiological fluid from the skin of a patient by puncture The device includes a body and sensors The body has a needle with a point for puncturing a physiological tissue and a channel in the body for conducting the physiological fluid away from the point The sensors are located in the body and are accessible to the physiological fluid conducting along the channel for physiological fluid analysis The device can be used to lance the skin and obtain a representative sample of the physiological fluid, with relatively simple procedures and quick analysis to minimize the exposure of the physiological fluid sample to air

Magnetic field induced capacitance enhancement in graphene and magnetic graphene nanocomposites

Abstract: Magnetic graphene nanocomposites (MGNCs) synthesized by a facile thermal decomposition method have been introduced. TEM observations reveal a uniform distribution of the Fe2O3 nanoparticle size and preferential nuclei growth along the edge defects. Both graphene and its Fe2O3 nanocomposites are prepared as electrochemical electrodes to evaluate their capacitor performances. Under normal conditions (without a magnetic field), the MGNCs show lower capacitance than graphene due to the large particle loading (52.5 wt%), which brings larger internal resistance and thus prevents efficient electron transportation within the electrodes. However, in the presence of an external magnetic field, both graphene and MGNC electrodes exhibit significantly enhanced capacitance as compared to the results obtained under normal conditions. Specifically, the capacitance of graphene is increased by 67.1 and 26.8% at the sweeping rates of 2 and 10 mV s−1, respectively. Even larger enhancements of 154.6 and 98.2% were observed in MGNCs at the same sweeping rates of 2 and 10 mV s−1, respectively. The energy density and power density of the electroactive materials are also dramatically enhanced in the presence of a magnetic field. Equivalent circuit modeling of impedance spectra revealed that the magnetic field played a critical role in restricting the interfacial relaxation process and thus enhanced the electrode capacitance. These findings present a potential revolution of traditional electrochemical capacitors by simply applying an external magnetic field to enhance the capacitance dramatically (even doubling it depending on the electroactive materials) without material replacement and structural modification.