Design recommendations when using SPIRIT1 RF IC

AN4169

10/14

Doc ID 023704 Rev 1

4

Design recommendations when using SPIRIT1 RF IC

The SPIRIT1 uses a class-E type TX matching network with a typical output power level of

+11 dBm. Two basic types of board layout configurations exist at all the frequency bands:

the split TX/RX type and the direct tie type. In the split TX/RX type the TX and RX paths are

separated and connected together by an antenna switch. In the direct tie type the RX and

TX paths are connected together directly without an additional RF switch. In this application

note the direct tie type is explored.

The schematic of the SPIRIT1 direct tie type application board is shown in Figure 6. The

layout of the critical zone of the SPIRIT1 direct tie type is shown in Figure 7.

Figure 6.

SPIRIT1 direct tie type application board schematic

AM14763V1