From RF to baseband: Trends at the GSM radio interface: Phone-buyer pressure to reduce handset size and cost and increase features places a premium on pcb space, BOM, and performance

摘要

For years, radio partitioning within the GSM handset was dictated predominately by RF design constraints and trans' ceiver integration. Today, the boundaries are blurred between the antenna-switch module (ASM), surface-acoustic-wave (SAW) filters, transceiver, power amplifier (PA), and baseband interface as phone buyers pressure handset makers to reduce size and cost while increasing features. That places a premium on pcb space, bill of materials, and performance and presents the handset designer with a wide array of choices at the radio interface.