2.3 RF Front-end

The following schematic snapshots show the reference schematic design for the RF front-end with the Linear Power Amplifier (LPA) after the matching capacitor (C13). This is followed by a discrete Low-Pass Filter (LPF) section designed for filtering the harmonic frequencies. The RF test point (TP1) is added in the design for verifying the performance of the device in both the prototype and production stage.

Two separate reference designs are provided, one with a PCB antenna variant and another with a U.FL connector for connecting an external antenna. Each variant has its own network impedance-matching components.

Figure 2-8. PCB Antenna Reference Design – RF Front-end Schematic Connection

Figure 2-9. U.FL Connector Reference Design – RF Front-end Schematic Connection