| 摘要 |
A circuit for pre-distorting a signal input to an amplifier includes a signal divider operable for dividing an input signal into signal portions that travel in a primary path and a secondary path. A delay element in each of the primary and secondary paths introduces a group delay to the signal portions in the respective paths. A signal combiner is operable for combining the signals in the respective paths into a combined output signal. A variable gain circuit is arranged in each of the primary and secondary paths. The variable gain circuit is operable to vary the level of the input signal in each path and thereby modulate the overall phase delay of the combined output signal.
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