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July 2007 [Components] Matching An ADC To A Transformer Analog signals are often digitized as quickly as possible in modern communications systems and test equipment in order to perform signal processing in the digital domain. But designing the transformer frontend circuitry for an analog-to-digital converter (ADC) can be challenging, especially in systems with high intermediate frequencies (IFs). Fortunately, this streamlined, five-step process can help develop an optimum front end for an ADC. It can be applied easily and quickly to... December 2005 [Communications] NPR Specification Aids Wireless System Analysis Noise power ratio (NPR) has been used to characterize communications systems since the onset of frequency-division-multiplexing (FDM) systems. Traditionally, NPR has been used to test noise and intermodulation distortion (IMD) in 4-kHz voice channels. It is also useful in modern systems for evaluating analog-to-digital converters (ADCs) for wideband applications. It represents a relatively easy ADC test method based on Gaussian noise input to simulate a broadband... |
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