Patent ID: 8107902
Filing Date: 2012-01-31
Classification: H03F

Abstract:
1. A method for reducing the current consumption and increasing the efficiency of an RF power amplifier (PA) with power enhancement that operates under large peak-to-average ratio input signals and is being adapted to provide a desired output power, comprising: a) for each level of desired output power; b) tuning the load, connected to the output stage of said PA, to essentially match the output impedance of said output stage, such that the RF load line of said PA has a slope that corresponds to the impedance required to provide said desired output power, while being in saturation; c) adjusting the level of enhancement to match the tuned load and said desired output power; d) whenever a smaller output power is desired in response to reduction in the input signal to said amplifier, further tuning said load, such that the RF load line has a slope that causes said power amplifier to essentially remain in saturation at the smaller desired output power, while being in saturation; and e) further adjusting the level of enhancement to match said smaller desired output power.