SYSTEMS AND METHODS FOR MAINTAINING A CONTROLLED POWER OUTPUT AT AN ANTENNA PORT OVER A RANGE OF FREQUENCIES DEFINED BY TWO OR MORE FREQUENCY BANDS

摘要

A multiband transceiver (200) including transmit sub-circuits (TSCs) arranged in parallel, a multiplexer (222) receiving RF signals from the TSCs at input ports (290, 292, 294), and a directional coupler (DC). Each TSC (210, 212, 214, 216, 218, 220) is configured to support communications in a respective frequency band. The multiplexer is configured to route signals from the input ports to a common output port (296) and to reduce harmonic distortion induced by the TSCs. DC (226) has an input port (1) connected to the common output port, a transmitted port (4) connected to an antenna port, and a coupled port (3) coupling a portion of the RF signal to a common feedback loop (CFL). The CFL (270) provides a feedback signal coupled to each TSC. Each TSC is responsive to the feedback signal for maintaining a controlled power output at the anterma port over a range of frequencies.