| 摘要 |
<p>An apparatus and method for generating a predistorted radio frequency signal, which avoids undesirable spurious emissions. A complex baseband signal, which has an in-phase component I and a quadrature component Q, is sampled and filtered in a sampling circuit and filter circuit to obtain samples I k and Q k , respectively. The magnitude x k of each sample pair is determined in a first calculation circuit. An amplitude and phase distortion factor D k , based on scaled values of the inverse hyperbolic tangent and the hyperbolic tangent of the magnitude, is determined in further calculation circuit and a multiplier. Each sample I k and Q k is multiplied by the corresponding distortion factor D k , and the resulting predistorted components combined and upconverted to provide a predistorted signal which is amplified in a power amplifier which has hyperbolic tangent distortion.</p> |
