Patent ID: 7308234
Filing Date: 2007-12-11
Classification: H03F

Abstract:
1. A power amplifier circuit for amplifying an RF signal, said circuit comprising: a splitter for splitting the RF signal into a main RF signal directed onto a main power amplifier path and a sampled RF signal directed onto an error correction path; a main power amplifier in the main power path for amplifying the main RF signal; a first attenuator in the error correction path for attenuating the sampled RF signal; an error correction amplifier in the error correction path for amplifying the attenuated and sampled RF signal from the first attenuator; a second attenuator in the error correction path for attenuating the amplified and sampled RF signal from the error correction amplifier; a phase shifter in the error correction path for phase shifting the sampled RF signal; and a coupler in the main power path for coupling the amplified main RF signal from the main power amplifier and the sampled RF signal from the error correction path to cancel out intermodulation products in the amplified main RF signal.