Patent attributes
Integrated circuits are provided with wireless communications circuitry having digital predistortion (DPD) circuitry, peak canceling circuitry, a power amplifier, and signal conditioning circuitry for controlling the DPD and peak canceling circuitry. The peak canceling circuitry may receive transmit signals and may clip peaks in the transmit signals that exceed a magnitude threshold value. The DPD circuitry may compensate for non-linear characteristics of the power amplifier by outputting a predistorted version of the clipped transmit signals. The power amplifier may receive the predistorted signals and may perform amplification to generate amplified signals. The signal conditioning circuitry may identify power transfer characteristics of the power amplifier and DPD circuitry using the predistorted signals and the amplified signals. The signal conditioning circuitry may update the magnitude threshold value imposed by the peak canceling threshold based on the identified power transfer characteristics to mitigate out-of-band spectral regrowth in the predistorted signals.
