By providing key components for every stage of RF transmission and reception, NXP makes it simple to create a wireless transceiver. This block diagram shows that, in the frontend receiver, NXP’s RF/IF components, RF MMICs, and discrete components implement a Single-Pole, Double-Throw (SPDT) switch, an LNA, an RF mixer, and a first LO. In the backend receiver, an RF/IF receiver serves as the second mixer and second LO, and provides the baseband functions for the Received Signal Strength Indicator (RSSI) and recovered audio. In the transmitter, RF MMICs and RF Discretes implement the VCO and Low Power Amplifier (LPA). To complete the solution, other NXP products, including the microprocessor, UART, and I²C devices, manage the system and perform user-interface functions.