Feed forward amplifier improvement

Details Feed forward amplifier improvement Feed forward amplifier improvement

H - Electricity

03

F

H03F 1/32 (2006.01) H03F 1/00 (2006.01) H03F 1/26 (2006.01) H03F 3/189 (2006.01)

Patent

CA 2252210

The present invention is a feed forward circuit and method for reducing distortion added to an output signal of the feed forward by its amplifiers without increasing the time delay in the main circuit path of the feed forward circuit. This is accomplished using a pre-distortion circuit to introduce a pre-distortion signal to the input signal of a correction amplifier. The pre-distortion signal being used to cancel a distortion signal that will be introduced by the correction amplifier. The pre-distortion signal has approximately the same frequency and amplitude as the distortion signal. The pre-distortion signal, however, has a phase difference of approximately 180° with respect to the distortion signal such that the pre-distortion signal and the distortion signal cancel each other when combined.

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