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FX5124D is a transmit and receive Front-End Module (FEM) with integrated power amplifier control designed in a low profile, compact form factor for quad-band cellular handsets comprising GSM850/GSM900 and DCS1800/PCS1900 operation. FX5124D supports quad-band GSM/GPRS, with matched 50-Ohm RF input and output ports. The FEM also supports UMTS applications through four high linearity TRx ports.

The module consists of a GSM850/GSM900 PA block and a DCS1800/PCS1900 PA block, impedance-matching circuitry for 50 ohm input and output impedances, Tx harmonics filtering, high linearity / low insertion loss RF switch, and a Power Amplifier Control (PAC) block. One PA block supports the GSM850 / GSM900 bands and the other PA block supports the DCS1800/ PCS1900 bands. Both PA blocks share common power supply pads to distribute current. The output of each PA block and the outputs to the four receive pads are connected to the antenna pad through an RF switch. Four broadband interchangeable receive ports provide flexibility to support multimode and multiband configurations.FX5124D consists of a CMOS power amplifier, a SOI SP6T antenna switch on a multi-layer laminate substrate.

Band selection and control of transmit and receive are performed using four external control pads. Refer to the block diagram in Figure 1 below. The band select pad, BS1,BS2,Mode, and TxEN select GSM850, GSM900, DCS, and PCS modes of operation. Housed in a compact 6.0mmx6.0mmx0.74mm package, the FX5124D greatly lowers the front-end complexity of GSM/GPRS solution, facilitates the customer's implementation, and saves board room and cost significantly.

The FX5124D is compatible with logic levels from 1.2V to 2.9V for BS1, BS2, MODE and TxEN pads.