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Industry News

High Voltage, Low Cost FETs for HPA MMIC Applications

M/A-COM is a longtime supplier to the military, Navy, Army and Air Force of GaAs MMICs, employed in active phased array radars. To date, the company’s GaAs process of choice has been its Multifunction Self-aligned Gate (MSAG™) process. MSAG features selective ion implantation with noncontacting stepper lithography to provide...
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A MEMS-based Amplified Switch Filter Bank

For more than 15 years, Spectrum SEI Microwave has developed PIN diode and MMIC-based switched filter banks. Recent advancements have made micro-electromechanical systems (MEMS)-based RF switches advantageous for particular applications. The model 310-020022-001 is SEI’s first MEMS-based switched filter bank. Switching The company was presented with a need for...
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A Mixed-signal ASIC for Digital RF Memory Applications

Digital RF memories (DRFM) are used for the reproduction of complex, coherent signals usually associated with modern pulse compression radars. There are many different implementations of DRFM systems. Figure 1 displays one particular type, a double sideband, four-bit, phase sampled system with 500 MHz of instantaneous bandwidth. Fig. 1...
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Accurate Power Detection of a CDMA Multi-carrier Power Amplifier Using a Logarithmic Amplifier

The accurate detection of the power output of a multi-carrier CDMA power amplifier enables the enhancement of power efficiency and harmonic suppression. Even though CDMA carriers with equal total power are applied, the experimental results, using a log...
In a typical multi-carrier power amplifier (MCPA) application, it is well known that good amplitude matching and good phase matching are required for greater reduction of intermodulation distortion (IMD) or for better harmonic rejection within the CDMA spectral mask. To solve the mismatching problem, it is desirable to accurately...
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High Performance Wideband MSAG Gain Block/Driver Amplifier MMICs Using MLP Technology

The multi-level plating (MLP) process has been used to develop a family of wideband, low noise, generic gain block and driver amplifier MMICs operating up to 20 GHz. MLP implementation provides significant performance improvements over standard MMIC pr...
Wideband, low noise, generic gain block and driver amplifier MMICs have been developed using many different device technologies including MESFET, HBT and PHEMT. Among these, PHEMT-based MMIC technologies have achieved superior performance due to inherent device high frequency operation capability. In order to achieve superior performance similar to PHEMT...
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Remote Sensing Through Satellites: A Tutorial Review

Remote sensing is a multi-disciplinary activity that deals with the inventory, monitoring and assessment of natural resources, following the analysis of data obtained through observations from a remote platform. This technology, under development since the early 1960s, has shown great promise in improving the information collection regarding the world’s...
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A Wideband MMIC-based Feedback Oscillator

Classic feedback oscillators have often been favored because of their low phase noise performance and wide frequency tuning characteristics. This article covers the basic theory of feedback oscillators, and shows how the addition of a vector modulator ...
The requirement for increased data rates in modern radio systems has led to higher order modulation schemes which, in turn, demand oscillators with lower phase noise. Meanwhile, manufacturers must also deliver low cost solutions covering many different frequency bands. These two criteria have generally been incompatible, since an improvement...
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Handheld Spectrum Analyzer for the 2.4 and 5 GHz WLAN Bands

Installation of WLAN data links has become commonplace whether within an industrial site, commercial establishment, or home use in both the 2.4 and 5 GHz bands involving 802.11 a, b, and g. Bantam Instruments’ Model 425A wireless LAN spectrum analyzer pushes the limits in frequency range, price and performance...
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Remotely-tunable Notch and Bandpass Filters for Evaluating System Performance

Tunable notch and bandpass filters can be very cost-effective in high frequency measurement and communications applications, especially when it is necessary to frequently change notch or bandpass frequencies. The alternative is to have available a large number of filters for discrete frequencies that must be manually swapped in and...
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Prescalers that Simplify X- and Ku-band Synthesizer Architectures

Microwave signals play an important role in modern communication architectures and radar applications. Used as carriers and signals for up and down conversion they have to comply with certain quality standards. The most important two are frequency drift, which is a measure of the long-term frequency stability, and phase...
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