A 4-layer PCB with a solid ground plane and a separate power plane is recommended. The device should be placed near the antenna, and the RF traces should be kept short and 50-ohm matched.
The device requires a 2.7V to 5.5V power supply, and the VCC pin should be decoupled with a 10nF capacitor. The EN pin should be tied to VCC or a digital signal for enable/disable control.
The device can handle up to 2W of continuous wave (CW) power, but it's recommended to derate the power handling capability based on the operating frequency and environmental conditions.
Check the PCB layout and assembly for any defects or damage. Verify the power supply and biasing conditions. Use a spectrum analyzer to measure the output power and noise floor. Consult the application notes and datasheet for troubleshooting guidelines.
The device is rated for operation up to 85°C, but the performance may degrade at higher temperatures. It's recommended to derate the power handling capability and ensure proper thermal management in high-temperature environments.
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SMS7621-040LF Overview
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