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449 results found for Components, displaying items 1 - 20

December 2008
Vectron’s Vision Of Frequency Control
Southern New Hampshire is home to beautiful summers and snow-kissed winters. It is also home to the corporate headquarters for one of the world’s leading crystal oscillator suppliers, Vectron International (www.vectron.com). Part of the diversified Dover Electronic Technologies group of engineering and electronics companies, Vectron International also boasts expertise and manufacturing ... — Jack Browne

December 2008
Equalize RF Amplifiers With Bandpass Filters
Filters and amplifiers can make a powerful combination, especially when the filter is used to equalize the amplifier. What follows is an approach to apply the complementary response characteristics of a bandpass filter to flatten the amplitude response of a transmit amplifier. The filter consists of a pair of asymmetric slow-wave open-loop resonators. It reduced ripple in a transmitter’s passband from 3.3 dB before equalization to 0.5 dB after... — Wei Hong , et al.

December 2008
Miniature VCOs Shrink Wideband Synthesizers
Compact frequency synthesizers fill many needs in modern communications systems. To achieve fullsized performance in miniature packages, Synergy Microwave has developed a line of compact frequency synthesizers that leverage novel, patented voltage-controlled-oscillator (VCO) technology1- 8 for the stability and low noise needed for emerging wideband, high-datarate wireless communications systems. ... — Ulrich L. Rohde , et al.

December 2008
Spread-Spectrum Clocks Cut EMI
Electromagnetic interference (EMI) can emanate from the smallest of sources, even from a system clock source. For that reason, oscillator designers at SiTime Corp. turned to spread-spectrum technology as a way to literally spread the EMI generated by their oscillators over a wider segment of frequency spectrum than normal. The end result is that interference at any specific frequency becomes less, with less... — Jack Browne

November 25, 2008
Multi-Tap Attenuators Save Board Space
Designed to eliminate the use of multiple attenuator devices in attenuation switching functions, the MTAQ1225 multi-tap attenuator saves board space as well as inventory costs. The multi-tap attenuators are available with wire-bondable or solder terminations and measure 0.125 in. x 0.250 in. x 0.015 in... — Lisa Maliniak

November 25, 2008
Tiny Surface-Mount GPS Antenna Delivers 80% Efficiency
In the W3011/3011A surface-mount GPS antenna, designers can take advantage of what’s billed as the world’s smallest GPS antenna and the highest-performing antenna in its size category... — Lisa Maliniak

November 25, 2008
Double-Layer Capacitor Sports Ultra-Low ESR
The BestCap capacitor series now includes ultra-low ESR, double-layer devices with an expanded temperature range from -40º to 75ºC. Well suited for wireless applications, the capacitor series features high capacitance values and power pulse characteristics for high-current, short-pulse applications including... — Lisa Maliniak

November 25, 2008
Bandstop And Cavity Filters Offer Tunable Center Frequencies
Two series of bandstop and cavity filters offers center frequencies that can be re-adjusted by the user. All filters are tunable over a ±7.5% center frequency range with minimal change in bandwidth... — Lisa Maliniak

November 25, 2008
SOT-227 Resistors Withstand Up To 4 kV AC
The MHP150 through MHP600 Series of high-density power resistors is now offered in power ratings ranging from 150W to 600W. With their wide range of power ratings, these SOT-227 resistors lend themselves to high-voltage circuits in high-frequency amplifiers, pulse generators, power-supply snubbers, and other applications... — Lisa Maliniak

November 25, 2008
100-W Power Combiners/Dividers Link Multiple Antennas, Transmitters
The H Series of 100-W Wilkinson combiner/dividers come in two-way, three-way, and four-way configurations for wireless applications between 400 MHz and 2.2 GHz. These combiner/dividers are well suited for systems applications that... — Lisa Maliniak

November 25, 2008
WiMAX Base-Station Antennas Close Coverage Gaps
A series of wideband WiMAX base-station antennas delivers single and double null fill capability for optimized coverage. The antennas’ design also allows for higher system performance by providing isolation specification... — Lisa Maliniak

November 2008
High-Speed ADC Offers 16 b At 200 MSamples/s
Analog-to-digital conversion plays a major role in many electronics systems, especially when signal processing is performed in the digital realm. The audio world has been accustomed to 16-b resolution at the audio standard sampling rate of 44.1 kSamples/s. But for radio-frequency (RF) signals, the road to high-resolution sampling has represented a much longer journey because of the sampling speeds needed to achieve such high resolution for RF ... — Jack Browne

November 2008
UWB Antenna Minimizes Size And Return Loss
Before the expected performance levels of Ultrawideband (UWB) communications can be reached, some challenges have to be overcome. It is therefore essential to study a suitable radiating structure— especially for pulsed devices that need minimum signal distortion. For example, the antenna should faithfully replicate the transmitted pulse on reception. In practice, however, the change of radiation characteristics with frequency alters the antenna response. Aside from... — Nancy Friedrich

October 2008
Tunable Oscillators Aim At Reduced Phase Noise
Tunable oscillators are instrumental in the operation of many systems, from commercial communications to military radars. And, while many characteristics define the performance of a tunable RF/microwave oscillator, one of the more difficult parameters to optimize is phase noise, which is critical to the performance of so many systems. For that reason, the design team at Synergy Microwave (... — Jack Browne

October 2008
Novel Approach Yields Fast, Clean Synthesizers
Frequency synthesizers are invaluable components in many systems, from commercial communications networks to test and measurement instruments.1 Because of their wide application, the RF/microwave industry constantly feels the pressure to deliver higher-performance, higher-functionality, smaller-size, and lower-cost synthesizer designs. In addition, as dictated by the ever-increasing data rates of modern communications systems, a major challenge in synthesizer ... — Alexander Chenakin

October 2008
High-Speed ADCs and DACs Arm Broadband Communications
Data converters, while not directly involved in RF/ microwave communications, play critical roles in those and other high-frequency systems. Whether it is the digital-to-analog converter (DAC) used to create the complex modulation needed to compress voice, video, and data onto limited-bandwidth signals, or the fast analog-to-digital converters that translate received signals into highresolution digital code, data converters are as important to modern... — Jack Browne

October 2008
Dual-Channel YIGs Filter Signals To 18 GHz
Filters based on yttriumiron-garnet (YIG) technology provide passbands or rejection bands that can be tuned across wide microwave frequency ranges. One of the companies that has succeeded in shrinking the size of the technology in recent years, Micro Lambda Wireless (www.microlambdawireless.com), in the form of its compact cubeshaped filters, has now packed two filter channels into these... — Jack Browne

October 2008
Surface-Mount Filters Meet RoHS Requirements
Hazardous waste from disposal of electronic products should be a concern to all involved with electronic design. The Restriction of Hazardous Substances (RoHS) Directive adopted by the European Union (EU) in 2003, of course, set limits on certain hazardous materials in the manufacture of electronic equipment. Although adoption of the RoHS guidelines has not been universal, those seeking components that comply with the RoHS Directive will usually find... — Jack Browne

September 2008
Understanding SAW Technology For Filters
Surface-acoustic-wave (SAW) filters are suitable for a wide range of commercial and military applications. Such lters can be made extremely small and durable, and they provide high rejection of unwanted signals. To learn more about them, a short but concise primer on SAW technology can be found on the Phonon Corp. web site at ( www.phonon.com). The tutorial article explains that there are two different types of SAW lters:... — Jack Browne

September 2008
RF Transistors Add Power, Subtract Heat
High-power RF transistor developers face the constant challenge of dissipating massive amounts of heat from small devices in order to achieve higher output-power levels. Ideally, the energy put into an RF transistor would be converted directly to RF output power, but such 100-percent drain efficiency can only be achieved in an ideal world. In reality, more than one-half of the power supplied to an RF transistor must typically be dissipated as heat, ... — Jack Browne