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Industry News

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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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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Passive Sensors Using RF Backscatter

An application of RF backscatter to monitor passive (zero DC power) sensors is presented. The technique uses an RF signal, from a probing platform, to probe a passive sensor. The passive sensor contains a transducer that acts like an impedance to RF si...
Low power wireless sensors are receiving considerable attention due to their multiple applications in the commercial and military scenarios. Wireless networks of “power aware” smart sensors are being developed that are deployed and forgotten, 1 as well as the sensor elements themselves. Transducers integrated with radio transceivers and networking...
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Cross-coupling in Microwave Bandpass Filters

The fast growing demand for microwave communication technologies, such as broadband wireless and satellite communication, point-to-point radio links, as well as a variety of radar systems, brings up stringent requirements to modern microwave filter design techniques aimed at minimization of electromagnetic interference, cross talks and jamming. The most critical...
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A High Efficiency Class-F Power Amplifier Design Technique

In this article, a medium power pseudomorphic HEMT device is used in the design of a high efficiency class-F power amplifier (PA) operating at 900 MHz. The purpose of this article is to describe the design procedure of a class-F PA with a very low drai...
High efficiency microwave amplifiers with low supply voltages are required for mobile telecommunications services, such as GSM or DCS1800 systems. Theoretically, class-F power amplifiers (PA) can achieve 100 percent drain efficiency by maximally flattening the voltage and current waveforms of the active device. 1 By increasing the efficiency of...
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Theory and Practical Considerations for Measuring Phase Noise Better Than –165 dBc/Hz: Part II

In part one of this article,1 the fundamental concepts of phase noise and phase noise measurements using direct spectrum analysis, instrument limitations, common sources of error and possible ways to minimize measurement errors were reviewed. In part t...
As discussed in part one of this article, the measurement of very good VCOs at large frequency offsets is limited by the spectrum analyzer’s dynamic range. This limitation can be overcome by using carrier filtering and selective amplification of noise at the offset frequency of interest. The bandpass filter...
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New Products

Ultra-high Speed Attenuator The model ADVAN-218-15DD options HS25NS and 5B is a 2 to 18 GHz digitally variable attenuator. This model offers a dynamic range of 15 dB in 0.5 dB steps and uses 5 bit binary control. The switching speed is 15 ns maximum, 6 ns typical. The...
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