EVB7238

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The EVB7238 evaluation board serves as the cornerstone of a comprehensive multi-port passive intermodulation (PIM) measurement system. The board includes two RF ports, one for input and one for output; two coaxial samples, one with an internal receiver at 10 MHz and one with an internal transmitter at 10 MHz for frequency control; and two USB ports to provide communications between the base station and the test receiver. It also contains a microcontroller, a PIC18F2389, to manage all of the operations of the board.The application field of the EVB7238 is mainly used for PIM measurements. PIM measurements measure the degree to which electrical signals are affected by nonlinearities in interconnecting components, such as connectors or RF filters. The degree of PIM is expressed in a unit called deciBel-meter (dBm). Because PIM can cause interference in radio systems, a reliable PIM measurement system is important. The working principle of EVB7238 is straightforward and efficient. An electric signal is formed in the electric field between the first and the second RF port. It is then conducted from the first to the second RF ports through a metal-dielectric waveguide, conducting cables, coaxial waveguides, and other components of the interconnect system. In the second RF port, the signal is quantified in terms of its amplitude and other parameters, which then gives the PIM measurement.In summary, the EVB7238 evaluation board is an essential tool for PIM evaulation and provides an efficient and reliable method of measuring PIM in the interconnect system. With its effective working principle, the board can accurately measure the PIM of any given system and serve as an important tool for engineers involved in RF evaluation and development.

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