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Recently developed advances in digital modulation and signal processing have enabled commercial and defense communication systems to transmit data at previously unattainable rates. Similar advances in the RF, microwave semi-conductor and transmission line technologies have allowed new communications systems like LTE and WiMAX™ to operate multi-channel communication on the order of tens of megahertz while modern radar and satellite communications systems can now operate over hundreds of megahertz of bandwidth so they can meet or exceed their mission needs. This paper illustrates that it is more important than ever to characterize broadband commercial and defense systems for linearity. In determining the overall linearity of these systems, we will focus on the tests used to determine the level of a system’s distortion products and how they relate to Intermodulation Distortion (IMD) and Intermodulation Distortion Noise (IMDN). Finally, we will compare these test methods and the instruments used.
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