DISTORTION REDUCING METHOD AND BIAS VOLTAGE CIRCUIT Russian patent published in 2007 - IPC H03F1/32 

FIELD: electronic engineering.

SUBSTANCE: mathematical model of nonlinearity can be presented as a sum of many components, some of them being of negative polarity. These components are proportional to transistor direct currents at bias voltages differing by low value. Bias voltage circuit has bias transistors functioning as scaled versions of main transistor. Each bias transistor generates direct current which is essentially one of components. Proposed method for voltage bias involves integration of currents in compliance with polarities of respective components for shaping DC signal proportional to chosen nonlinearity. Feedback circuit reads out DC signal and generates bias voltages for bias transistors which make DC signal equal zero. One of bias voltages is supplied to main transistor with the result that its chosen nonlinearity is eliminated.

EFFECT: ability of eliminating unwanted distortion components.

28 cl, 9 dwg