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Industry News

Standard 5 V Medium Power InGaP Darlington Amplifiers

Wideband Darlington gain blocks have become a workhorse for RF wireless and wireline applications. The broadband linearity and direct-coupled performance has found a multitude of commercial design-ins for base station pre-drivers, repeater-pole transceivers, fiber optic transceivers, CATV and instrumentation systems. One of the drawbacks of existing Darlington amplifier solutions,...
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Silicon-based Surface-mount I-Q Modulators/Demodulators for RFID and Wireless Applications

Two new surface-mount I-Q modulators/demodulators have been added to the “RFID by M/A-COM” series of products that are designed for RFID, wireless handset and base station applications. The MA4IQP900L-1291T and the MA4IQP900H-1291T HMIC I-Q modulators/demodulators are compact and highly functional devices using low and high barrier silicon Schottky diodes,...
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DC to 18 GHz Test Cables

A series of wideband 50 ? coaxial test cables has been introduced that feature extra rugged construction with integrated strain relief for longer life. The CBL-series Coaxial-Flex test cables are designed for use from DC to 18 GHz and are useful over a temperature range of –55° to +105°C....
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WiMAX – A Standard Air Interface for Broadband Wireless Access

Broadband Wireless Access (BWA) enables a variety of applications ranging from high bandwidth backhaul for data networks to simple wireless DSL for residential customers. Although this is a large and diverse market, most of these wireless systems are implemented using proprietary or vendor specific technologies. There is almost no...
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Design of a Feedback Predistortion Linear Power Amplifier

A new feedback predistortion linearizing method is proposed and analyzed. This method extracts the third-order intermodulation distortion (IMD) signal from the main power amplifier (PA) output signal and the original input signal and uses it as the pre...
Mobile communication systems currently use multi-carrier/multi-channel schemes for effective use of the frequency spectrum resources. The intermodulation has a serious impact on these communication systems in terms of adjacent channel interference, resulting in an increase of bit error rates. As the power amplifier operates close to the saturation region...
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Techniques for the Integration of High-Q Millimeter-wave Filters in Multi-function MMIC Modules

There has been a widespread trend toward higher levels of integration in microwave and millimeter-wave system design, motivated by a desire to reduce cost, size and complexity, particularly as many old applications are being re-invented in array architectures. The most commonly used format for achieving high levels of integration...
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An Archery-target Antenna

The "archery-target" antenna presented in this article is a directional antenna evolved from the short-backfire antenna (SBFA). The new antenna has an additional annular reflector and a much-increased large reflector when compared to the SBFA. The arch...
Parabolic-reflector antennas are widely used as microwave directional antennas. Unfortunately, the illumination of a parabolic mirror becomes rather inefficient when the dimensions of the mirror are not large enough compared to the wavelength. On the other hand, the directional gain of microwave cavity antennas1 is rather small, since it...
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A Novel Frequency Doubler Using a Feedforward Structure and DGS Microstrip for Fundamental and High Order Components Suppression

A novel design of a frequency doubler, using a feedforward technique and a defected ground structure (DGS), is described. In the proposed frequency doubler, the feedforward loop suppresses the fundamental component (fo), and the DGS attenuates the high...
The demand for a signal source with high stability and low phase noise increases in microwaves, millimeter-wave communications and radar systems. High frequency signal sources can easily be obtained by multiplying low frequency signals that have relatively high stability and low phase noise. In general, however, frequency multipliers include...
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A Quasi-balanced Frequency Doubler Using Alternate Power Dividing and Combining Techniques

The design and analysis of a novel balanced-like high conversion gain frequency doubler is presented, employing alternate power dividing and combining techniques. In this design approach, all positive and negative cycles of the sinusoidal source signal...
Due to the inherent upper limit in operating frequency of active devices in local oscillators, a frequency multiplier, in conjunction with a low frequency local oscillator, has often been used as a signal source, providing better overall phase-noise performance and low cost realization. 1 A balanced configuration has been...
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GaAs-, InP- and GaN HEMT-based Microwave Control Devices: What is Best and Why

The properties of a single-pole, single-throw (SPST) switch using various technologies (InP-, GaAs- and GaN-based HEMTs) are reviewed and discussed in the context of their suitability for microwave and RF control applications. Insertion loss, isolation...
Solid-state switches based on high electron mobility transistors (HEMT) can be fabricated with a variety of different semiconductor technologies, usually selected on the basis of performance requirements. Such solid-state switches have been used successfully as control devices for transmitter and receiver switching functions in various digital communications systems. In...
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