Method and system for reducing non-linearities

摘要

Non-linearities of signal-generation circuits (201) that typically include a series arrangement of a modulator (102) and a power amplifier (104) are reduced by connecting a measurement circuit (203) to an output of the signal-generation circuit (201) and at another point along a signal path of the signal-generation circuit (201). A predistorted input signal is applied to an input of the signal-generation circuit (201). The pre-distorted signal includes a constant component and a time-varying component, such that the predistorted input signal excites nonlinear modes of the signal-generation circuit (201). The measurement circuit (203) is balanced so that a portion of the predistorted input signal that passes through the measurement circuit (203) does not include a time-varying component and therefore does not excite non-linearities of the measurement circuit (203). Adjustments (112) are made to the predistorted input signal in order to reduce non-linearities of the signal-generation circuit (201). <IMAGE>