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Industry News

A High Speed Family of Commercial Track-and-Hold Devices for

A new class of very high input analog bandwidth and high sampling rate track-and-hold amplifiers (THA) has been developed for test and measurement, automatic test equipment (ATE), digital receivers and radar systems using a commercially available indium phosphide (InP) technology. Inphi® Corp.’s GigaTrack™ family of 2 GS/s track-and-hold amplifiers...
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Design of Three-line Multi-layer Microstrip Directional Couplers at HF for High Power Applications

A practical method for designing three-line microstrip directional couplers at high frequency (HF) for high power applications is given for the first time using multi-layer dielectrics. The forward-coupling slope characteristic of the directional coupl...
It is common practice to use directional couplers in the HF range (3 to 30 MHz) for high power RF/microwave applications, such as magnetic resonance imaging (MRI), plasma generation for semiconductor processing equipment and laser drivers, in order to measure the transmitted and reflected powers accurately. Microstrip-type directional couplers...
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CMOS Oscillator Design Considerations

The oscillator is a critical part of modern wireless communication systems. It is the local oscillator that is used to up-convert the baseband signal to the desired RF frequency in the transmitter. Vice versa, the local oscillator is used to down-convert the desired signal in the receiver. In the...
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The Book End

Coplanar Microwave Integrated Circuits Ingo Wolff Wiley Interscience • 557 pages; $120 ISBN: 0-471-12101-0 The subjects of this book—materials, technology, design and realization of coplanar microwave integrated circuits—combine the research results of a large research group under the leadership of the author. Chapter 1, the introduction, describes the different...
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A Practical Method for Determination of HBT Thermal

A practical and reliable method for the determination of thermal resistance and its power dependence is presented. This method requires only forward Gummel data at different ambient temperatures and at different collector-emitter bias vo...
Heterojunction bipolar transistors (HBT) have demonstrated high power output densities at microwave frequencies and are increasingly utilized in the design of RF circuits such as power amplifiers, oscillators and mixers. 1 Thus, an accurate large-signal model for HBT devices is of great importance in designing such circuits, especially when...
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A Feed-forward Amplifier Using an Equal Group-delay Signal Cancellation Technique

In this article, new signal cancellers that can match the out-of-phase and group delay of two signal paths simultaneously are proposed. The simultaneous matching of the out-of-phase and group-delay time between two paths can permit broadband signal can...
Modern wireless communication systems utilize digital modulation techniques employing linear complex coding schemes to maximize the channel throughput available capability. Also, a broader channel bandwidth is used for more data transmission than before. In addition, as various communication services, such as cellular phone (IS-95), personal communication service (PCS), IMT-2000...
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New Products

GaN Broadband Power Amplifier The model SSPA 0.5-3.0-50 is a high power, broadband, GaN RF amplifier that operates in a frequency range from 0.5 to 3 GHz. This PA is ideal for broadband military platforms as well as commercial applications because it is robust and offers high power over...
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Advanced Control Components Receives $3.7 M Production Order

Advanced Control Components Inc.</B> announced that it has received a production order in excess of $3.7 M from the National Radio Astronomy Observatory for a dual-channel downconverter/switch matrix used on the ALMA Program.
Advanced Control Components Inc. announced that it has received a production order in excess of $3.7 M from the National Radio Astronomy Observatory for a dual-channel downconverter/switch matrix used on the ALMA Program. ALMA (Atacama Large Millimeter Array) is an international collaboration to develop a world-class telescope composed of...
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Ask Harlan: Question of the Month - April 2007

Published April 6, 2007 In an effort to better combine the editorial content of our magazine with our newly developed and retooled on-line presence, we have decided to expand Harlan's RF and microwave engineering advice into a monthly feature that appears in Microwave Journal. Harlan has selected one question...
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A Varactor-tunable Filter with Constant Bandwidth and Loss Compensation

This article presents the basic concept and realization of a bandpass varactor-tunable filter with constant bandwidth and loss compensation. The filter components are based on step-impedance planar resonators, while the equalizing circui...
Varactor-tunable filters attract the attention of microwave specialists due to a number of advantages that can improve the overall performance of communications and radar receivers, as well as measuring equipment. One of the drawbacks of such filters is a considerable variation in bandwidth (BW) and insertion losses (IL) within...
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