| 摘要 |
The Reflect Forward Adaptive Linearizer Amplifier (RFAL Amplifier) assembly (15) in FIG. 1 provides a linerizing method that uses the input reflected signal of the Main 1 Amplifier (23) to develop an intermodulation-correcting signal. The invention incorporates a directional coupler at the input of the Main 1 amplifier that samples and sums the input reflected signal from the Main 1 Amplifier and the forward fundamental input signal to form a distortion-correcting signal that contains both the fundamental and the distortion products of the output. By proper delay and amplification of this correcting signal, it can then be used to drive another Main amplifier (35) to both cancel the output distortion products and double the output power of the Main 1 Amplifier with significant improvement of the overall linearity and efficiency of the final amplifier assembly. The technique allows the use of lower cost transistor up to the Pout at the 1-dB Gain Compression Point with significant distortion cancellation.
|
