| 摘要 |
The present invention relates to an analog predistorter ( 100 ) having a tunable amplitude ( 60 ) and/or phase ( 80 ) expansion. The predistorter ( 100 ) includes a coupler ( 110 ) having an input port ( 112 ), an output port ( 114 ), a first ( 116 ) and a second ( 118 ) coupled port separated by 90 degrees. A first compensation circuit ( 120 A) is connected to the first coupled port ( 116 ) and comprises a first combination ( 130 A) of linear ( 132 A) and nonlinear ( 131 A) circuit elements and a first impedance adjusting unit ( 140 A) for adjusting the impedance seen by the nonlinear circuit element ( 131 A). A second compensation circuit ( 120 B) is connected to the second coupled port ( 118 ) and comprises a second combination ( 130 B) of linear ( 132 B) and nonlinear ( 131 B) circuit elements a second impedance adjusting unit ( 140 B) for adjusting the impedance seen by said nonlinear circuit element ( 131 B). By adjusting the impedances seen by the nonlinear circuit elements ( 13 IA, 131 B) the amplitude ( 60 ) and/or phase ( 80 ) expansion of the predisorter ( 100 ) are tuned.
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