Patent ID: 7830220
Filing Date: 2010-11-09
Classification: H03C,H03F

Abstract:
1. A modulator arrangement, comprising: a power amplifier comprising a signal input configured to receive a carrier signal, a current control input, a supply voltage input and a signal output; a supply voltage modulator comprising an output coupled to the supply voltage input of the power amplifier and an input coupled to a data input and configured to modulate a supply voltage at the output thereof as a function of a control signal received at a control input thereof; a bias current modulator comprising an output coupled to the current control input of the power amplifier and an input coupled to the data input, and configured to modulate a bias current at the output thereof as a function of a control signal received at a control input thereof; and a control unit comprising a power control input configured to receive power control data, and a power control output coupled to the supply voltage modulator and to the bias current modulator, and configured to control the supply voltage modulator and the bias current modulator based on one or more control signals derived from the power control data a signal processing unit coupled to the data input and configured to receive input data, and comprising a first output coupled to the respective inputs of the supply voltage modulator and the bias current modulator and configured to provide an amplitude component of the input data, and comprising a second output and configured to provide a phase component of the input data; a phase modulator configured to provide a carrier signal which is phase modulated based on the phase component from the signal processing unit; a predistorter device configured to predistort the amplitude and the phase component as a function of a characteristic of the power amplifier based on a predistortion control signal, wherein the predistortion control signal is generated by the control unit depending on the control signal; a feedback unit configured to provide a feedback signal derived from an output signal of the power amplifier to the predistorter device, and wherein the feedback signal is configured to adapt predistortion coefficients stored in the predistorter device, wherein an amplitude of the feedback signal further depends on a feedback gain factor provided by the control unit depending on the control signal, wherein the predistorter device is configured to generate an adaptation signal based on the feedback signal, and wherein the control unit is further configured to derive a predistortion control signal from the adaptation signal.