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White Papers

An IQ Demodulator-Based IF-to-Baseband Receiver with IF and Baseband Variable Gain and Programmable Baseband Filtering

June 17, 2014
A direct conversion architecture for a receiver is presented in this paper. Direct conversion radios perform just one frequency translation, compared to a superheterodyne receiver that can perform several frequency translations. One frequency translation is advantageous because it reduces receiver complexity and power consumption, it avoids image rejection issues and unwanted mixing products, and it offers high selectivity (ACRR).

Techniques for Precise Cable and Antenna Measurements in the Field Using Agilent FieldFox Handheld Analyzers

June 17, 2014
This application note introduces the practical aspects of cable and antenna testing. It covers interpreting measurement results and instrument operation including calibration options such as CalReady and QuickCal using FieldFox configured as a cable and antenna analyzer. Measurement examples are provided showing techniques for measuring insertion loss, return loss, and locating faults in a transmission system.

Assessing the Parameters that Influence Reliability in GaN-Based Solid-State Power Amplifier Architectures

May 19, 2014
Accel-RF Instruments President, Roland Shaw, addresses the significant parameters that affect the reliability assessment of solid state power amplifiers utilizing GaN HEMT semiconductors. This tradeoff study contrasts three architectures of SSPA designs to demonstrate how a chosen topology may affect the mean time to failure of the resulting amplifier module. The example details the decision process for a multi-stage GaN HEMT Ka-band frequency SSPA utilizing the following topologies: Septum binary combiner, Waveguide radial combiner and Parallel-plate combiner. These architectures are viable candidates for Ka-band SSPA designs due to the low-loss combining techniques used in the implementation of the balanced output stage.

A new Coaxial Flow Calorimeter for Accurate RF Power Measurements up to 100 Watts and 1 GHz

May 19, 2014
How Accurate Are Your High Power RF Measurements? Accurate power measurements of RF signals can be difficult to achieve without the proper calibration infrastructure. This paper describes a flow calorimeter that lowers the uncertainty of 100 W, 1 GHz measurements to 0.43% of full scale. Using this system, through-line wattmeters can be calibrated automatically with an uncertainty of 0.55%.

Testing S-Parameters on Pulsed Radar Power Amplifier Modules

May 19, 2014
This Application Note describes testing S-parameters under pulsed conditions. A constant power level calibration is included. A LDMOS S-band radar power transistor is used as example DUT. The pulse profile mode of the R&S ZVA is used to analyze the time-dependent behavior of the DUT.

RF/Microwave Technologies - A Better Alternative In Defense Electronics

May 19, 2014
The Defense Industry is facing many challenges. From shrinking budgets to Better Buying Power 2.0 to increased competition for program wins. And, for applications that rely on RF and microwave technologies, the supply base is highly fragmented resulting in increased costs and risks for prime contractors. Mercury is pioneering open architectures for RF/Microwave solutions and has implemented a concept around Advanced Microelectronics Centers (AMC) to provide the design, manufacturing and testing capabilities needed to deliver on key program needs. This whitepaper discusses why open architectures will be a game changer in RF/Microwave and what makes the AMCs unique and relevant.

Wavelex Products Facilitate Both Multi-octave Bench Testing and Multi-system Testing

May 19, 2014
This paper addresses the use of Wavelex wideband products in test setups for multi-octave and multi-system testing, as well as the advantages of using these wideband products for the testing of narrowband systems. Specific products are presented, along with an example test setup that allows for multi-system testing of ISM 868 MHz, ISM 915 MHz, and avionics transponders at 978 MHz, 1030 MHz, and 1090 MHz, without the need to change components.

AR's Complete Product Catalog for EMC & RF Testing

May 19, 2014

AR has just completed a brand new edition of our sought after full line product catalog. We have expanded our facility to provide unparalleled high power capabilities to test RF amplifiers in excess of 10,000 watts and added various new RF and microwave power amplifiers to our extensive product lines. The catalog continues to be easy to use, with "find-it-fast" charts and color coding to help get right to whatever you need for RF & EMC testing.

Eliminating the Tradeoffs and Limitations of Your Pulse Measurement Test Solution

May 19, 2014
Next generation radar systems face multiple difficult demands. The pace and variety of new requirements need multi-use/function/mode adaptive radars, to be used for different applications. This whitepaper reviews existing pulse measurement test methods; discusses advantages/limitations; and introduces new test method that takes advantage of high-speed digitizing architecture, offering the industryâ??s highest resolution/timing accuracy level.

Expanding Bandwidth with Ferrite Loaded Transmission-Line Devices

April 15, 2014
Many passive multiport devices - such as power dividers/combiners, baluns, hybrids, and impedance transformers - rely on electromagnetic (EM) coupling for their intended functions. In the microwave range this is typically achieved through a usage of capacitive (electrical) coupling between the closely spaced transmission lines. Adding the magnetic coupling by utilizing the ferrite-loaded transmission lines allows significantly expanding the operation band both up and down in frequencies. This paper provides the theoretical explanation for such a broad frequency effect of ferrite materials and illustrates the theory by presenting the 3-D simulation results for 2:1 impedance ratio ferrite transmission-line transformer.

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