Interference reduction between RF communications bands

摘要

Radio frequency (RF) power amplifier (PA) circuitry and a PA envelope power supply are disclosed. The RF PA circuitry receives and amplifies an RF input signal to provide an RF output signal using an envelope power supply signal, which is provided by the PA envelope power supply. The RF PA circuitry operates in either a normal RF spectral emissions mode or a reduced RF spectral emissions mode. When reduced RF spectral emissions are required, the RF PA circuitry operates in the reduced RF spectral emissions mode. As such, at a given RF output power, during the reduced RF spectral emissions mode, RF spectral emissions of the RF output signal are less than during the normal RF spectral emissions mode. As a result, the reduced RF spectral emissions mode may be used to reduce interference between RF communications bands.

主权项

1. Circuitry comprising:
radio frequency (RF) power amplifier (PA) circuitry comprising a quadrature RF PA and adapted to:
receive and amplify an RF input signal using the quadrature RF PA to provide an RF output signal using an envelope power supply signal;operate in one of a normal RF spectral emissions mode and a reduced RF spectral emissions mode, wherein a quadrature balance of the quadrature RF PA is better in the reduced RF spectral emissions mode than in the normal RF spectral emissions mode;when reduced RF spectral emissions are required, operate in the reduced RF spectral emissions mode, such that the quadrature RF PA has higher PA linearity in the reduced RF spectral emissions mode than during the normal RF spectral emissions mode; andwhen reduced RF spectral emissions are not required, operate in the normal RF spectral emissions mode; and a PA envelope power supply adapted to provide the envelope power supply signal.