Patent ID: 9197168
Filing Date: 2015-11-24
Classification: H03F

Abstract:
1. An apparatus to generate amplitude modulation to phase modulation (AMPM) predistortion data that compensates for phase distortion in a power amplifier of a communication device, the apparatus comprising: a test signal generator to generate a baseband test signal that is upconverted and provided to the power amplifier; a reference oscillator to generate a reference oscillator signal; a coupler to obtain the amplified test signal from the power amplifier; a combiner coupled to the reference oscillator and the coupler to combine, by wave superposition, the amplified test signal and the reference oscillator signal into a resultant signal that is an outcome of interference between the amplified test signal with the reference oscillator signal; a measurement circuit to generate a measurement signal that characterizes the resultant signal; and a processor coupled to the measurement circuit and configured to: