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White Papers

3G/4G Multimode Cellular Front-end

This paper presents multiple architecture options available to fill different design needs,Single mode architectures optimized for performance and converged multi-mode architectures optimized for size and solution configuration.
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Buying a Signal Analyzer

This paper will help you to ask the relevant questions when choosing from the many analyzers available in the market today. It will help you make a well-informed decision when purchasing an instrument to measure and display frequency vs. amplitude.
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Concepts of Orthogonal Frequency Domain Modulation

This paper will describe OFDM and show why it has the ability to improve the spectral efficiency of digital radio links. It will also discuss the use of Multiple Input/Multiple Output (MIMO) antennas to improve signal reception and combat the effects of multipath fading.
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Improving Multi-carrier PA Efficiency Using Envelope Tracking

This article describes a technique based on envelope tracking that has been proven to offer a dramatic improvement in efficiency, from typically 15% to over 50%, while offering multiband performance.
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Microwave Point-to-point Systems in 4G Wireless Networks and Beyond

This paper focuses on challenges wireless companies and their transmission engineers are facing in order to meet the capacity, reliability, performance, speed of deployment, and cost challenges in microwave point-to-point networks.
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A Modified Wilkinson Power Divider with Harmonic Suppression Characteristic

The design, simulation and test results of a modified corporate type Wilkinson power divider / combiner in microstrip configuration where all the λ/4 branch line impedances have equal characteristic impedances (Zo) instead of conventionally used π2Z are presented.
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De-mystifying Single Carrier FDMA: The New LTE Uplink

This article focuses on the physical layer (“Layer 1”) characteristics of the LTE uplink, describing the new Single-carrier Frequency Division Multiple Access (SC-FDMA) transmission scheme and some of the measurements associated with it. Understanding the details of this new transmission scheme and measurements is a vital step towards developing LTE UE designs and getting them to market.
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A Novel Compact Monopole Antenna with a Parasitic Plate for WLAN Applications

This paper proposes and studies a monopole antenna with a parasitic plate for WLAN applications. In this design, a microstripline-fed rectangular patch creates a resonant mode at 3 GHz. Furthermore, a parasitic plate is added on the side of the ground plane to generate a dual-band operation of 2.39 to 2.91 GHz and 4.06 to 6.73 GHz. The overall size of the proposed antenna is only 26x40x0.8 mm3(WsubxLsubxH). The monopole antenna with a parasitic plate is calibrated for WLAN applications, which cover the bands from 2.4 to 2.48 and 5.15 to 5.825 GHz. This antenna has the advantage of compact size, simple structure and good radiation characteristics.
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Application Note: Designing GaAs Power Amplifiers for Femtocells

The author discusses the function of a femtocell in 4G architecture and the role of the RF power amplifier.
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VCO Design Lesson 1

This is the first of a two-part series that discusses certain fundamentals in voltage-controlled oscillator design.
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