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Around the Circuit

Agilent Technologies Inc. and Varian Inc. announced that they have signed a definitive agreement for the acquisition by Agilent of Varian, a worldwide supplier of scientific instrumentation and associated consumables for life science and applied market applications. Agilent will pay $52 cash per share of common stock for Varian...
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Microwaves in Europe: Upbeat During the Downturn?

The end of 2008 and the beginning of 2009 saw the global recession take hold. This report considers the current state of the European RF and microwaves sector, how the EU is taking collective responsibility, the technological developments necessary to ...
The economic downturn has impacted governments, industries, companies (large and small) and individuals. The RF and microwaves industry is no exception and while its diversity means that some sectors have faired better than others, very few have remained unscathed. Unfortunately, for many companies the terms restructuring, rationalisation and cost...
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A Needle in a Haystack: Optimizing Mixer Selection Using Progressive New Tools

Bob is asked to develop a new radio system design, with some tough goals on RF performance and power consumption. Like many RF engineers, Bob has never really been comfortable with mixers. There is something mysterious about how they convert one frequency to another, and his formal education only...
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Nonlinear Extensions for VNAs: Quid Pro Quo?

To keep up with the growing needs of business sectors such as telecommunications, automotive, domotics, medical, aerospace and defense, the performance requirements of RF and HF transistors and amplifiers are increasing sharply. These products need to be affordable, and they must be able to handle more complex information, consume...
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A Highly Miniaturized Active 90° Power Combiner MMIC Employing CE and CC Circuits

In this work, a highly miniaturized active 90° power combiner, employing InGaP/GaAs heterojuntion bipolar transistors (HBT), was fabricated on a GaAs substrate for MMIC applications. A novel composite structure employing common-emitter (CE) and common-...
A 90° power combiner has been used for signal mixing at the intermediate frequency (IF) output port of an image rejection mixer. 1,2 Until now, a passive branch-line coupler was mainly employed for 90° power combining. 1,3 However, the passive branch-line coupler occupies a very large circuit area. For...
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S-band Low-loss Wide-bandwidth Microwave Surface Acoustic Wave Filter

A novel S-band low-loss wide-bandwidth microwave microstrip, surface acoustic wave (SAW) filter used in spread spectrum communication systems was designed and implemented. The 16 micron input/output interdigital transducer (IDT) on the 64°-rotated Y-cu...
Recently, many types of wireless communication systems have rapidly developed and the demand for bandwidth has increased. The spread spectrum communication systems, such as the code division multiple access (CDMA) systems have attracted increasing attention because of their unique features that make it possible to transmit signals through noisy...
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