Patent ID: 8380144
Filing Date: 2013-02-19
Classification: H03F,H04B

Abstract:
1. A system providing digital predistortion for a dual-band transmitter comprising: first tuning circuitry adapted to tune a first baseband signal to a first intermediate frequency to provide a first intermediate frequency signal; second tuning circuitry adapted to tune a second baseband signal to a second intermediate frequency to provide a second intermediate frequency signal; combiner circuitry adapted to combine the first intermediate frequency signal and the second intermediate frequency signal to provide a combined intermediate frequency signal; and predistortion circuitry adapted to predistort the combined intermediate frequency signal to compensate for a non-linearity of a power amplifier in a transmit chain of the dual-band transmitter, thereby providing a predistorted signal; wherein a separation between the first intermediate frequency and the second intermediate frequency is at or near a minimum separation value below which one or more frequency bands in the predistorted signal for up to a target intermodulation order overlap frequency bands in the predistorted signal centered at the first and second intermediate frequencies.