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Industry News

A Portable Compact Range-based Antenna Measurement System

When measuring small production antennas and antenna-based assemblies, as well as for the development of millimeter-wave antennas, a requirement exists for a measurement system that is not only small but also fully portable. Designed to fulfill these needs is ORBIT/FR’s Mini-Compact Range Chamber, which is a portable test facility...
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A High Frequency Reference Module

With more than seventy years of design and development expertise in frequency control and timing, Valpey Fisher has developed an extensive knowledge base that today is leveraged to bring innovative custom solutions to demanding frequency control applications. The company is intensely focused on bringing to its customers the most...
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A High Performance GSM Quad-band PA Module with Breakthrough Size Reduction

Performance, cost and size are key to mobile phone design. Improved performance, lower cost and ever-shrinking module size parameters are universal challenges in the competitive world of mobile phone manufacturing. Over the past four years steady improvements have been made in power amplifier efficiency. Prices have likewise dropped. Yet...
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Power PHEMT Advantages in Infrastructure Requirements

Filtronic Compound Semiconductor has created a new line of power PHEMT devices designed for infrastructure applications. These devices are useable at frequencies from 900 MHz cellular through 3.5 GHz WLL applications. The use of PHEMT technology results in power FETs with superior performance in ACPR and efficiency, both critical...
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RF Power 2005

Power, efficiency, linearity: pick any three — such a choice just about summarizes the challenges presented to the power amplifier (PA) designer in 2005. As wireless systems pack more data into limited bandwidths, power amplifiers carry a bigger burden but are still required to be efficient. Simultaneously, in order...
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Amplifier and Transistor Gains Revisited

There are some fundamental basics on two-port network models. Microwave amplifiers, like the one depicted in the block diagram of Figure 1 , have been traditionally designed with scattering parameters with a goal of power gain over some prescribed bandwidth. This model format is justified because, at high frequencies,...
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A 2 to 20 GHz High Power Amplifier Using Spatial Power Combining Techniques

Combining high power microwave amplifiers with performance covering decade bandwidths is difficult to achieve. Commercially available MMIC chips offer power levels only in the 1 W range. Traveling-wave tube amplifiers (TWTA) that provide high broadband...
High power broadband amplifiers are a crucial element for a variety of defense electronics and telecommunication systems. However, the product of power and bandwidth is fixed for a specific amplifying device, that is, the broader the bandwidth, the less the output power. Hence, a variety of broadband power combining...
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Design of Linear S-band Power Amplifiers with High Power-added Efficiency

In wireless communications, linearization of the PA is sometimes required to ensure high quality of the modulated signal and maintain good PAE. PA linearization using a feed-forward technique 1–4 can be very tedious and time consuming. Without PA linearization, an approach to achieve high power and good PAE is...
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A Four-channel Full-duplex T/R Module for Multi-frequency Phased Array Applications

This article presents a broadband transmit/receive module for multi-frequency phased array applications. The T/R module transmits at 10 and 19 GHz and receives at 12 and 21 GHz. The module consists of two novel harmonic-suppressed microstrip multiplexe...
Rapid progress in telecommunication and radar technology is placing increasing demands on wireless system performance. Such demands include high information capacity and the ability to track multiple mobile targets or users. 1–3 Military research programs in particular are placing heavy emphasis on Network Centric Warfare, a wireless network concept...
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A Unified Theory for Nonlinear Distortion Characteristics in Different Amplifier Technologies

This article presents a unified theory of power amplifier nonlinear distortion characteristics under small- and large-signal regimes for a wide range of active device technologies. It shows that some handy interactions between mild and strongly nonline...
RF power amplifiers (PA) are the last active blocks in any wireless transmitter system, handling the highest levels of RF signal and supply power. Linearization enforcing techniques relying on either adding external circuitry to the PA, or simply improving its design, 1 are thus necessary. However, since the first...
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