SKY66121-11 Transmit/Receive Front-End Module Skyworks Solutions Inc. SKY66121-11 Transmit/Receive Front-End Module features a power amplifier (PA) capable of more than +30dBm of transmit output power (VCC = 3.6V). The SKY66121-11 FEM has a two-wire interface allowing functionality control. Additionally, the SKY66121-11 offers a deep 'sleep' mode, drawing less than 1µA of current.