Issue link: https://resources.mouser.com/i/1484091
33 Qorvo 2022 Figure 1 shows a traditional eCall design using discrete switches. There are multiple RF pathways, which means the system engineer must meticulously match each path to optimize the design. Figure 1 also illustrates the complexity of such a system, as each signal will require multiple digital GPIO controls (GPIO—general purpose input/output) for each path. This traditional design requires careful PC board design of splitters or the addition of external splitters to accommodate the proper layout and lower RF losses. Figure 1: Example of a traditional eCall switching architecture. (Source: Qorvo) Here is a list of some challenges seen with this traditional design approach: • The FR4-PC board material requires careful matching, which adds insertion losses and lowers performance. • The addition of matching and power circuitry increases the system's thermal temperature, limiting overall performance. • There is limited design flexibility when configuring the switching matrix for different antenna configurations. • There is limited ability to have a common layout for higher-tier design models with dual SIM dual active (DSDA) versus non-DSDA.