Patent ID: 6566945
Filing Date: 2003-05-20
Classification: H03F

Abstract:
A feedforward amplifier, comprising:combining means for combining an input signal with a first pilot signal; first error detection means for amplifying the input signal that is combined with the first pilot signal by said combining means, and for detecting an error component in the input signal amplified; first error rejection means for canceling out the error component in the input signal amplified by said first error detection means by combining the input signal with the error component; second error detection means for detecting the error component and the first pilot signal residual in the input signal combined by said first error rejection means; and second error rejection means for combining the input signal combined by said first error rejection means with the error component and the first pilot signal detected by said second error detection means to cancel out the error component and the first pilot signal residual in the input signal, wherein said first error detection means adjusts amplitude and phase of the input signal combined with the first pilot signal by said combining means to minimize a signal level of the first pilot signal.