Reducing the cost and design complexity of wireless products
The wide acceptance of this design topology stems primarily from its low cost and simplicity
. A SAW device is resonated with transistor Q1 in a Colpitts oscillator structure to form the carrier frequency, and transistor Q2 provides the output power amplification and isolation needed for stable operation. Data from the MCU is applied directly to the SAW resonator to form the OOK modulated signal, and GPIO6 from the MCU supplies the voltage (VCC) to the SAW-based transmitter. This entire solution uses 24 external components, including the MCU, one bypass capacitor, a quartz crystal used to clock the MCU, and a PCB with a trace antenna and capacitor. It has an RF component cost (excluding the PCB, MCU and bypass capacitor) of $0.77 USD in 100,000-unit volumes. The $0.77 RF BOM cost does not include the cost of the MCU, bypass capacitor or PCB. Traditionally, this has been the lowest component cost solution available for reliable RF transmission. From a system cost perspective, the large BOM count increases other costs, such as labor, inventory and tests, and reduces manufacturing yield.Reducing the cost and design complexity of wireless products
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