Fully Custom Build-to-Print Shipboard RF Switch Network and LNA
Recently, a customer needed a fully custom RF switch network and low noise amplifier for a shipboard application. We designed a durable, compact unit consisting of a two stage RF switch network and 5-bit attenuator, optimized for maximum electrical performance, maximum physical and electrical durability, and maximum operational lifetime. The two stage RF switch network allowed the user to control each of three external RF input signals passing through a programmable attenuator and LNA. We configured the switches to provide a break-before-make characteristic to guarantee a blanking of the RF between each change in selected RF input. The 5-bit digitally programmable attenuator allowed the user to set any attenuation value from 0 to 31 dB. The internal LNA was carefully selected and optimized for low noise figure, high gain, and minimum signal distortion.