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Altium adds LatticeSC/M FPGA support to Altium Designer |
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Octasic Announces High Performance Asynchronous DSP Core |
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Interwise licensed SPIRIT voice technology |
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eSOL / Ittiam Partnership to Offer Codec Solutions for TI DaVinci™ Processors. |
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Freescale adds new design center in China . |
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3G Video Gateway Solutions Based on DSP Multimedia Processing Boards. |
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New Precision DACS for Industrial Automation from Analog Devices |
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Altera and BittWare Jointly Develop Software Programmable Reconfiguration Platform. |
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| Basics of choosing and designing the best filter for an effective data-acquisition system - by Bonnie Baker, Texas Instruments |
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One of the jobs of a circuit designer is to build a measurement system that provides valid input-to-output data as defined by the system requirements over a given frequency range. The four possible elements of a signal path include a gain/signal conditioning cell, an anti-aliasing filter, an analog-to-digital converter (ADC) and a digital processing block.
This article describes when to use an analog filter and when the digital filter more appropriate. Additionally, the article shows how to select the correct anti-aliasing filter for three different types of sensor signals; a dc (static) temperature signal, a multiplexed step response, and an ac (dynamic) photosensing signal. more>>
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Direct Digital Frequency Synthesis - a Basic Tutorial - by
Osicom Technologies |
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a few years ago the DDS was a phenomenon with little utility, but now it is an important design tool that can not be ignored by the architects of any system demanding frequency agility. All other signal generation techniques begin with some sort of oscillator, the output of which is manipulated or controlled by the synthesizer. The DDS is unique because it is digitally deterministic; the signal it generates is synthesized from a digital definition of the desired result.
A DDS uses logic and memory to digitally construct the desired output signal, and a data conversion device to convert it from the digital to the analog domain. Therefore, the DDS method of constructing a signal is almost entirely digital, and the precise amplitude, frequency, and phase are known and controlled at all times. more>>
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