| 摘要 |
A feedforward-type distortion compensation circuit which can compensate for a non-linear distortion component generated by a main amplifier. The circuit has a main amplifier path in which the main amplifier, a first variable attenuator and a first variable phase shifter are interposed, first and second delay line paths, a first power distributor for distributing an input signal to the main amplifier path and the first delay line path, an auxiliary amplifier path in which an auxiliary amplifier, a second variable attenuator and a second variable phase shifter are interposed, a second power distributor interconnecting the main amplifier path and the second delay line path, a first power combiner interconnecting the first delay line path and the auxiliary amplifier path, a second power combiner combining the signals from the second delay line path ant the auxiliary amplifier path to output, and a signal transmission path connecting between the branch ends of the second power distributor and the first power combiner. First and second pilot signals are coupled with the input signal and the signal transmitting the main amplifier path, respectively. The first variable attenuator and the first variable phase shifter are controlled in response to level and phase differences of the first pilot signal components at the first power combiner, respectively. Similarly, the second variable attenuator and the second variable phase shifter are controlled in response to level and phase differences of the second pilot signal components at the second power combiner, respectively. |
