Electronics & Computers

Software Defined Radio Handbook

Software Defined Radio has revolutionized electronic systems for a variety of applications that include communications, data acquisition and signal processing. Recently updated, this handbook shows how DDCs (Digital Downconverters), the fundamental building block of software radio, can replace legacy analog receiver designs while offering significant performance, density, and cost benefits.

Posted in: Electronics & Computers, White Papers

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High-Speed A/Ds for Real-Time Systems

Recently updated, this handbook reviews the markets and technology for A/Ds with sampling frequencies higher than 100 MHz; it discusses sampling and filtering techniques and new FPGA technology for A/Ds; typical high speed A/D products are presented, along with some high-speed data acquisition applications.

Posted in: Electronics & Computers, White Papers

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Putting FPGAs to Work in Software Radio Systems

Recently updated, this handbook reviews the latest FPGA technology and how it can be put to use in software radio systems. FPGAs offer significant advantages for implementing software radio functions such as digital downconverters and upconverters. These advantages include design flexibility, higher precision processing, lower power, and lower cost.

Posted in: Electronics & Computers, Semiconductors & ICs, White Papers

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High-Speed, Real-Time Recording Systems Handbook

Recently updated, this handbook reviews some of the techniques and features that are widely desired in a high-speed, real-time recording system. Among others, these include the use of a non-proprietary file system, the use of a client-server architecture, and the presence of a user-friendly API (Application Programming Interface) for integrating the recorder into a larger system.

Posted in: Electronics & Computers, White Papers

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Serial Fabrics Improve System Design

Recently updated, this handbook reviews the development of switched gigabit serial fabrics to enhance the VMEbus and PMC mezzanines; the role of FPGAs in implementing this technology; and, finally, how some of the latest VXS, XMC, OpenVPX, PCIe, and AMC products can be used in high-speed data acquisition, recording, and software radio systems.

Posted in: Electronics & Computers, White Papers

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Ultra-Wideband, Dual-Polarized, Beam- Steering P-Band Array Antenna

The novel design geometry can be scaled with minor modifications. A dual-polarized, wide-bandwidth (200 MHz for one polarization, 100 MHz for the orthogonal polarization) antenna array at P-band was designed to be driven by NASA’s EcoSAR digital beam former. EcoSAR requires two wide P-band antenna arrays mounted on the wings of an aircraft, each capable of steering its main beam up to 35° off-boresight, allowing the twin radar beams to be steered at angles to the flight path. The science requirements are mainly for dual-polarization capability and a wide bandwidth of operation of up to 200 MHz if possible, but at least 100 MHz with high polarization port isolation and low cross-polarization. The novel design geometry can be scaled with minor modifications up to about four times higher or down to about half the current design frequencies for any application requiring a dual-polarized, wide-bandwidth steerable antenna array.

Posted in: Electronics & Computers, Briefs, TSP

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Centering a DDR Strobe in the Middle of a Data Packet

The Orion CEV Northstar ASIC (application-specific integrated circuit) project required a DDR (double data rate) memory bus driver/receiver (DDR PHY block) to interface with external DDR memory. The DDR interface (JESD79C) is based on a source synchronous strobe (DQS\) that is sent along with each packet of data (DQ). New data is provided concurrently with each edge of strobe and is sent irregularly. In order to capture this data, the strobe needs to be delayed and used to latch the data into a register.

Posted in: Electronics & Computers, Briefs

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