Walt Kester
 Write for Microwaves & RF
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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...