Patent ID: 8890618
Filing Date: 2014-11-18
Classification: H03F

Abstract:
1. A zero-voltage-switching contour based outphasing power amplifier apparatus, comprising: (a) a first power amplifier configured to receive a first drive signal at an input and having an output configured for connection to a first side of a load, said first power amplifier comprising: (b) a second power amplifier configured to receive a second drive signal at an input and having an output configured for connection to a second side of the load, said second power amplifier comprising: (c) means for generating said first drive signal and said second drive signal at a desired duty cycle and varying the phase difference between said first drive signal and said second drive signal to maintain efficiency of said power amplifier apparatus in response to a varying output load; (d) means for varying capacitances of said first variable drain capacitor array and said second variable drain capacitor array in response to duty cycle; and (e) means for differentially varying capacitances of said first variable load capacitor array and said second variable load capacitor array in response to determining impedance values for said first power amplifier and said second power amplifier.