LNA reference design for 5.8GHz ISM applications

The circuit provides high gain, robust overpower monitoring, and protection, all in a small footprint. This feature is an excellent addition to any 5.8 GHz ISM band application where low signal strength or distance may be a complication.

This LNA receiver reference design is a high-performance RF receiver system with +23 dB of gain, optimised for operation at a centre frequency of 5.8 GHz.

Input is unfiltered, maintaining a noise figure of 2 dB, while a bandpass filter at the output attenuates out-of-band interferers.

The CN0534 circuit includes a high-speed overpower detector and switch that protects sensitive downstream equipment connected to the receiver system.

The receiver system automatically returns to regular operation when the RF power level drops within the acceptable range.

RF inputs and outputs are standard SMA connectors, and the entire design is powered from a single Micro-USB connector.