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應用說明
RF power amplifiers (PAs) and front end modules (FEMs) are essential for modern wireless device operation. PA and FEM components, including PAs, LNAs, tuners, filters and switches, typically include a serial bus interface to support reconfigurations for power and band settings. As the variety of RF protocols increases so do the demands on the PA/FEM components and RFIC to PA/FEM communications. To better address these serial communications, the MIPI® alliance has developed the RF front end interface (RFFE) specification. The MIPI RFFE communications bus standard provides both PA/FEM suppliers and users a common serial communications framework to build on.
Validating RFFE communication robustness for new PA/FEM components includes basic communication validation for PA/FEM control, as well as extensive bus timing and logic level margin testing. Methods to characterize and validate PA/FEM serial bus performance and IO pin parametric performance are described in this application note. RFFE interface test is the primary focus, although the general concepts apply to other master/slave serial bus configurations including SPI.
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