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Industry News

Around The Circuit

Industry News Dr. Leo Young Dr. Leo Young died September 14, 2006, of complications from cancer. He was 80 years old. He was a pioneer in the microwave industry and served as president of both MTT-S and IEEE. He received his BS degree in physics and math in 1946...
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A Helical Resonator-based Filter with Improved Skirt Selectivity

Helical type resonators are widely used for frequencies below 0.5 GHz, mainly for mass and dimensional considerations. Replacing the more traditional TEM combline types or dielectric resonators by helical resonators significantly reduces the size and mass of the filters at the expense of the insertion loss. The rather complicated...
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Power Amplifier Linearization Using an Indirect-learning-based Inverse TDNN Model

In this article, an effective digital predistortion procedure of data acquisition, analysis, modeling and linearization for high power amplifiers is presented, based on tapped delay neural networks (TDNN). Memory effects of high power RF amplifiers wer...
Current research studies are drawing more and more attention on the memory effects of high power amplifier linearization, especially for cellular base transceiver system applications. 1,2 Although many studies on power amplifier linearization have been conducted, linearization of strongly nonlinear systems with large memory, which exacerbates the performance of...
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Kulicke & Soffa Closes Purchase of Alphasem

Kulicke & Soffa Industries Inc. closed the previously announced purchase of Alphasem, a supplier of die bonder equipment, from Dover Technologies International Inc., a subsidiary of Dover Corp. The purchase price was $27.1 M in cash, after a working capital adjustment and subject to further post closing adjustments. "We...
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Comtech Receives Order for Satellite Communications Equipment

Comtech Telecommunications Corp. announced that its Tempe, Arizona-based subsidiary, Comtech EF Data Corp. , received a $2.8 M order from a leading communications integrator for its turboIP® performance enhancement proxy. The units will be deployed to support US Government installations around the world. Comtech EF Data's turboIP performance enhancement...
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Keithley and Mesatronic Enter Agreement

Keithley Instruments Inc. , a leader in solutions for emerging measurement needs, announced it has partnered with Mesatronic Group , Voiron, France, to develop advanced probe cards for semiconductor parametric testers used in RF and low current DC applications. William Merkel, marketing director for the Keithley Parametric Test Product...
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WiMedia UWB PHY Design and Testing

New wireless networking standards commonly present design challenges in the physical layer, which in turn present circuit simulation and testing challenges. The WiMedia MB-OFDM UWB signal with its low power, hopped, 528 MHz wide OFDM format is a curren...
With the blessing of the WiMedia Alliance, the stage is set for widespread implementation of certified wireless USB and next-generation Bluetooth 3.0 products, using multi-band orthogonal division modulation (MB-OFDM)-based ultra-wideband (UWB) physical layer (PHY). Wireless USB supports data rates of 53.3, 80, 106.7, 160, 200, 320, 400 and 480...
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Complete RFIC Design Flow Targeting Next Generation Wireless Front-ends

Besides the circuit design itself, a complete design flow based on a prescribed methodology is crucial for a successful implementation of next generation wireless front-ends. An integral part of this process is a scalable front-to-back solution that no...
The demand on mobile communications has grown over recent years. Today’s mobile communication systems use sophisticated signal processing to achieve high transmission rates. The challenges for the next generation wireless systems will increase even further, when designs will need to meet multi-standards and achieve reconfigurability. Evaluations of various integration...
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HSPA: New Challenges for Power Amplifiers in UMTS User Equipment

Mobile radio technology, based on the universal mobile telecommunications system (UMTS), is developing at breakneck speed. Network operators worldwide are currently upgrading their networks with new high speed downlink packet access (HSDPA) technology, which optimizes the data transmission from the network to the user equipment (downlink). New transmission methods...
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