SKY55951-11 Front-End Module (FEM) Skyworks Solutions Inc. SKY55951-11 Front-End Module (FEM) features an integrated L1 low-noise amplifier (LNA) and post-filter along with an L5 LNA and post-filter designed for Global Navigation Satellite System (GNSS) receiver applications. Part of the Sky5® portfolio, the SKY55951-11 provides high gain, low current consumption, and integrated input and output matching for L1 and L5, all in a compact package.