Components
 662 results found for Components, displaying items 1 - 20

February 2010
Low-Power LNA Drops Noise At 2.4 GHz
Low-noise-amplifier (LNA) design requires tradeoffs, often among such goals as noise figure, gain, linearity, and stability. In addition, portable applications call for low power consumption. But through the use of a common- gate (CG) architecture for input impedance matching and reduced power consumption through currentreuse techniques, an RF CMOS LNA was developed with 15.5-dB forward gain and 1.68 dB noise figure at 2.4 GHz. With its excellent...  — Baimei Liu , et al.

February 2010
Match The Ports Of Differential Devices
Differential or balanced devices are widely used in communications systems for their high immunity to noise. However, they can be difficult to integrate since the widely used S-parameter matching method cannot simply be applied. Fortunately, a generic method derived from the mixed-mode S-parameter concept can be used to match differential devices. It is simple and effective, as will be borne out by verification via four-port vector network analyzer (VNA) and...  — Stephane Wloczysiak

February 2010
Optimize Class E Power Amplifiers
Amplifier efficiency is essential not only for mobile devices, but increasingly to conserve power consumption in wireless communications base stations and cell sites. The Class E amplifier in this article produced efficiency of 60 percent from 1.9 to 2.2 GHz using a standard packaged transistor. 1 The techniques used to design and build this amplifier can be employed to design Class E amplifiers at any frequency of interest. The Class E...  — Gayle Collins , et al.

February 2010
RFIC Amps Add Gain Where Needed
Amplifiers, whether as RF gain blocks, as low-noise amplifiers (LNAs), or power amplifiers (PAs), are essential building blocks in microwave systems. Over the last decade, a growing number of RF integrated circuit (RFIC) amplifiers have become available in place of larger and more expensive discrete designs. While these RFIC products can’t always match the pure performance of a discretedevice amplifier, RFICs provide the convenience of small size and,...  — Jack Browne

February 2010
On-Glass Vehicle Antenna Receives FM For RVs
AS AN ALTERNATIVE to monopole-type antennas, many commercial vehicles now provide frequencymodulation (FM) reception via antennas that are printed directly on the rear or quarter glasses of a vehicle. Unfortunately, these on-glass antennas tend to possess a low vertical gain and narrow bandwidth. They also exhibit nulls in their radiation patterns, as they are placed in close proximity to the conducting frame of the vehicle and are printed on glass with high...  — Nancy Friedrich

February 2010
Antenna-In-Package Forges Interconnection At 60 GHz
TO ENABLE VERY-HIGH-DATA-RATE applications, the IEEE 802.15.3c standards group is defining specifications for 60-GHz radios that use only a few gigahertz of unlicensed spectrum. Typically, those radios have been designed by assembling several monolithic microwave integrated circuits (MMICs) in gallium-arsenide (GaAs) semiconductor technology. Yet a recently proposed antenna, which targets highly integrated 60-GHz radios, is specifically designed to exhibit...  — Nancy Friedrich

February 2010
Filter Mitigates Interference For Astronomy Observations
TO BLOCK UNWANTED frequencies, it is common to place a very-high-Q high-temperature-semiconductor (HTS) filter before the low-noise amplifier (LNA) of a radio telescope’s front end. A miniaturized HTS four-pole filter for the RF interference mitigation of the 900-MHz cellular band in radio telescopes was recently presented by Alonso Corona-Chavez from Mexico’s National Institute for Astrophysics, Optics, and Electronics; Ignacio Llamas-Garro from Spain’s...  — Nancy Friedrich

February 2010
13.5-GHz SPDT Switch Boosts Test Performance
THE PE42556 SINGLE-POLE DOUBLE-THROW (SPDT) RF switch vows to augment test-equipment performance while enabling the reliable testing of next-generation RF ICs. The absorptive switch, which is designed on the proprietary Ultra- CMOS silicon-on-sapphire process technology, spans 9 kHz to 13.5 GHz with low 1.7-dB insertion loss at 13.5 GHz and typical return loss of 13 dB at that frequency. It also guarantees fast switch-settling time of typically 3.3...  — Nancy Friedrich

January 2010
Match Loop Antennas Via Mutual Inductance
Loop antennas are widely used in small wireless products, particularly for UHF bands between 300 and 1000 MHz. They are small in size relative to wavelength, independent from a ground plane, and relatively immune to the influence of nearby objects. They are also easily implemented in printedcircuit form with corresponding low cost. But their low radiation resistance makes them difficult to match and subject to low efficiency. They exhibit high...  — Alan Bensky

January 2010
Dissect PA Distortion From OFDM Signals
Power-amplifier (PA) distortion must be minimized in any broadcast application to prevent interference with adjacent channels. Distortion can be present in the form of amplifier clipping, intermodulation distortion (IMD), and memory effects. For some communications standards, such as Brazil’s ISDB-T standard, which is based on orthogonal frequency- division-multiplex (OFDM) modulation, excessive phase distortion in the transmit amplifiers...  — Jose De Souza Lima , et al.

January 2010
Wireless Monitors Enhance Sport And Fitness Equipment
WELLINGBOROUGH, UK—The use of wireless monitors and sensors to enhance physical activity is a trend that is sweeping the fitness and sports-equipment industry as well as the general public. Wireless technologies, such as 5-kHz, ANT, Bluetooth, Bluetooth low energy, GPS, ZigBee, NFC, and Wi-Fi low energy, each could be the front-runner for devices like consumer heart-rate monitors, speed and distance or cadence sensors, and foot pods. However, the playing fields aren’t...  — Dawn Hightower

January 2010
Microwave Sensor Can Identify Dangerous Liquids At Airports
JUELICH, GERMANY AND BEDFORD, ENGLAND— Emisens and Microtek have introduced a liquid-identification system that could enable airport authorities to lift restrictions on passengers carrying bottles of liquid in their hand luggage. The system, which is known as EMILI 1+, uses a microwave-sensing technique to identify whether the contents of a bottle are harmless, inflammable, corrosive, or explosive. At the heart of the system is a multimode ...  — Paul Whytock

January 2010
SMD Antenna Supports 10 Wireless Protocols
CAMBRIDGE, ENGLAND—A switchable-magnetic-dipole (SMD) antenna capable of supporting 10 wireless protocols has been developed by Antenova (www.antenova.com). The Agilis A10346 is a small, switchable magnetic dipole antenna (MDA) providing global dual-mode GSM/LTE capability plus Wi-Fi, Bluetooth, and WiMAX in a single structure. “There has been an increasing demand from device manufacturers for small, embedded LTE antennas for mobile devices such as...  — Paul Whytock

January 2010
PA MMIC Leverages GaN-On-SiC HEMT Technology
MODERN ELECTRONIC-WARFARE (EW) systems require amplifiers with high power, wide bandwidth, and high efficiency. One way to increase output power for high-bandwidth applications is to use a highvoltage transistor technology. Today’s galliumnitride (GaN) transistors operate with nearly an order-of-magnitude increase in power-supply voltage while delivering gain and efficiency that rival gallium-arsenide (GaAs) PHEMT devices. At TriQuint Semiconductor, the...  — Nancy Friedrich

January 2010
Radar Sensor Has Roots In Antenna Switching
FOR PHASED-ARRAY RADAR sensors, the design should be a simple structure with fewer receivers than antennas. A K-band, frequency-modulated, CW (FMCW) phased-array radar sensor with a low-complexity receiver based on antenna switching was recently proposed by Moon-Sik Lee from Korea’s Electronics and Telecommunications Research Institute together with Yong-Hoon Kim from Korea’s Gwangju Institute of Science and Technology. Using a beamforming method, the ...  — Nancy Friedrich

January 2010
Electro-Absorption Modulator Reaches 60 GHz
PHOTONICS INNOVATIONS are behind the release of a combined modulation and photodetection transducer that can work to 60 GHz. The device, dubbed the 60G-REAM- 1550, exhibits just 3.6 dB insertion loss. It provides digital optical modulation at 50 Gb/s and RF modulation over its bandwidth. In terms of photodetection, the transducer offers 1.0 A/W responsivity and 43 GHz bandwidth. The 60G-R-EAM-1550, designed for use with a laser diode source, operates within the...  — Nancy Friedrich

January 2010
Cable Assemblies Attenuate 0.22 dB/ft. At 18 GHz
THE LL335 SERIES of extremely low-loss cable assemblies features attenuation of 0.22 dB/ft. at 18 GHz. The 0.335-in. cable assemblies achieve typical attenuation of 0.048 dB/ft. at 1 GHz and 0.17 dB/ft. at 10 GHz. They can handle 1800 W CW input power at 1 GHz and 600 W CW input power at 10 GHz. The cable assemblies offer shielding effectiveness of greater than 95 dB with a low coefficient of thermal expansion from -55° to +200°C, thereby ensuring that...  — Nancy Friedrich

January 2010
Frequency Synthesizer Acts As Broadband Signal Generator
TO SERVE A VARIETY of applications requiring a portable test source, the MBS-8000 broadband RF signal generator covers 500 to 8000 MHz. The unit tunes in 100-kHz steps with better than 10 ms switching speed. It utilizes a 10-MHz external or internal reference. The MBS-8000 operates from +5 VDC at 230 mA. From -30° to +70°C, it features +7 dBm output power and less than -95 dBc/Hz phase noise offset 100 kHz from an 8-GHz carrier. The 3.5-x-2.5-x-0.6-in. signal generator ...  — Nancy Friedrich

January 2010
Shrinking Directional Couplers Boost Power And Bandwidth
Directional couplers are often needed to monitor incident or reflected power, sample signals, or inject signals onto transmission lines. These passive components are critical to power-measuring instrumentation and communication systems. By combining construction techniques with simulation software, directional-coupler makers have been able to reduce real estate as they boost the power-handling capability of their units at higher frequencies and with broader bandwidths. A large...  — Ashok Bindra

January 2010
Ceramic Duplexer Serves 1900-MHz Base Stations
A surface-mount, monoblock ceramic duplexer dubbed the model AM1880-1960D268 serves wireless-base-station transceiver communication applications from 1850 to 1960 MHz. In terms of transmit-to-receive response, the 50-Ω duplexer exhibits insertion loss of 3.4 dB or less from 1850 to 1910 MHz and minimum return loss of 11 dB. It provides attenuation ranging from 45 dB for DC to 1000 MHz to 38 dB for 2040 to 2100 MHz. Regarding antenna-to-receiver response, it ...  — The Editors of Microwaves & RF





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