| 摘要 |
An error correction amplifier and method of canceling distortion in an amplified signal. The error correction amplifier includes a main amplifier operable to receive a main input signal and generate an amplified signal having a main component and an error component. The error correction amplifier also includes a second amplifier coupled in a feed-forward arrangement to the main amplifier and operable to receive an input signal and to generate an output signal having a main component and an error component. A balancing network is coupled to the main amplifier and to the second amplifier. The balancing network isolates a sample of the output signal of the main amplifier, inverts the sample, and combines the sample with the input signal to the second amplifier. A summing point combines the output signal from the main amplifier and the output signal of the second amplifier such that the error components of the two output signals substantially cancel one another and the main components of the output signals are added to one another. The method involves providing a first signal path with a gain and a phase, providing a second signal path that is 180° out-of-phase to the first signal path and that has a gain that is about two times greater than the gain of the first signal path, providing a third signal path with a gain and a phase, and providing a fourth signal path that has a gain and a phase that are substantially the same as the gain and the phase of the third signal path. |
