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Industry News

High Efficiency Power Amplifier Driving Methods and Circuits: Part I

Use of a low frequency active device model in the analysis of high efficiency power amplifier methods and circuits
A considerable research effort has been invested to optimize the efficiency of high frequency power amplifiers. The work has been focused on output load network design for high frequency active devices. However, the attention received by the driving waveforms and input circuits has been quite low compared to that...
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Simulation and Measurement of a C-band Low Noise Dielectric Resonator Oscillator

The design, construction and optimization of a C-band dielectric resonator oscillator (DRO) is described and investigated. The resonator was characterized separately by mounting it on a 50 Ω microstrip line, and fitting an equivalent circuit to th...
Microwave oscillators form an important part of all microwave systems, such as those used in radar, communication links, navigation and electronic warfare. 1 Oscillators are required to have excellent frequency stability against variations in temperature, power supply voltage and oscillator loading (load pulling). They also need a power output...
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A Temperature-compensated Closed Loop Overdrive Level Controller for Microwave Solid-state Power Amplifiers

The reliability of GaAs power FETs used in solid-state power amplifiers (SSPA) is adversely affected when operated in an overdrive (excess input power) condition for a long time due to excess gate current. Manufacturers of SSPAs use different schemes to protect the FET power devices from overdrive conditions. One...
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High Efficiency, High Power WCDMA LDMOS Transistors for Base Stations

OEMs, operators and manufacturers of base station RF power amplifiers are constantly striving for greater efficiency, whether it be in the number of connections (calls) that can be made via a base station or the amount of DC power needed to make those calls. For both scenarios, the RF...
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Multipin Headers with Integrated Filtering

Thunderline MultiPins™ address the many space and time saving issues facing today’s high frequency designers. In addition to being more compact than individual feedthrus, the use of MultiPins saves installation time and automatically maintains critical pitch and spacing dimensions. They are available in a variety of styles from 2...
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65 GHz VNA Test Port Extension Cables

Most VNA measurements require the use of extension cables as part of the test set-up. Measurement accuracy can be severely degraded if these cables are not stable over time and flexure. Thus, the choice of measurement cables is as important as the instrument itself. The MegaPhase® VN series are...
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Frequency Extension Source Modules to Extend Signal Generator Capability from 50 to 325 GHz

Since the mid-1940s, there have been requirements for test sources above 50 GHz. Magnetrons were first pressed into this application during the early to mid-50s, and by the middle of the decade, some manufacturers, such as Demornay Bonardi, were constructing multipliers using a cartridge diode with a window milled...
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A One-box Solution for Spectrum and Vector Signal Analysis

A spectrum analyzer is an important instrument for all RF/microwave engineers. Measurements of spectral purity, phase noise and spurious signals are everyday tasks for which a spectrum analyzer is the instrument of choice. Additionally, in today’s world of digitally modulated signals, modulation accuracy is a significant category of measurements...
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Automation and Real-time Verification of Passive Component S-parameter Measurements Using Loss Factor Calculations

An automated S-parameter testing approach, built around a LabVIEW program, is described that adds important capabilities to a microwave test setup. A real-time check on S-parameter data using total loss calculations is shown to be a good indicator of m...
In developing microwave models, real-time verification of characterization data should be considered a priority to ensure its integrity. Sound models must be built upon accurate measurement data, and, as is generally the case, the ‘garbage in – garbage out’ principle applies to model extraction. Even if an instrument calibration...
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Trigger-Capture-Analyze: Three Steps Toward Understanding Today's Complex RF Signals

The recent proliferation of new RF applications has brought about a dramatic increase in spectrum usage, particularly in the unlicensed bands used by many of the new devices. Crowding virtually guarantees the presence of RF interference. This has led to adaptive techniques that can change power, data rate and...
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