Layout notes

Layout Recommendations

To optimize the performance of your circuit design, it is advisable to separate the RF and output circuits on the PCB board into different areas.

Maintaining a 50-ohm impedance along the RF signal path is crucial for effective transmission. Therefore, it is important to keep the RF signal path as short as possible.
Additionally, it is essential to avoid routing RF signals in close proximity to digital signals, oscillators, power switches, or other RF transmission circuits.
Furthermore, it is recommended not to route RF signals through other modules or above/below existing signal paths.

In order to minimize signal loss, it is best practice not to place RF signal traces on inner layers of multi-layer PCBs.
When routing RF signal traces, it is important to avoid sharp bends. Instead of a single 90-degree turn, using two 45-degree turns can help maintain optimal signal integrity.
Furthermore, it is advisable to minimize any crossing between RF signal traces and other circuits as each crossing point introduces additional inductive impedance.
Lastly, for connecting RF ground bypass capacitors, it is recommended to use low equivalent series resistance (ESR) ceramic capacitors and position them near the pins they are connected to for optimal performance.