Wireless devices having multiple transmit chains with predistortion circuitry

摘要

An electronic device may include wireless communications circuitry that has first and second digital predistortion circuits. The first predistortion circuit receives a first signal at a first frequency while the second predistortion circuit receives a second signal at a second frequency. The first circuit may perform predistortion operations on the first signal using non-unity predistortion coefficients to generate a predistorted signal. The second circuit may apply unity predistortion coefficients to the second signal to generate an undistorted signal. An adder may combine the predistorted and undistorted signals to generate a combined signal that is amplified by amplifier circuitry. An antenna may transmit the amplified signal. By over-distorting the first signal with the first predistortion circuit while the second predistortion circuit does not distort the second signal, the circuitry may mitigate non-linearity in the amplifier while allowing for carrier aggregation operations to be performed with minimal power consumption.

主权项

1. Wireless communications circuitry, comprising:
a first digital predistortion circuit that receives a first signal at a first frequency and that is configured to perform predistortion operations on the first signal using a set of non-unity predistortion coefficients to generate a predistorted signal; a second digital predistortion circuit that receives a second signal at a second frequency that is different from the first frequency and that is configured to apply a unity predistortion coefficient to the second signal to generate an undistorted signal; adder circuitry that is configured to combine the predistorted signal and the undistorted signal to generate a combined signal; and radio-frequency amplifier circuitry that is configured to amplify the combined signal to generate an amplified signal.