Patent ID: 8792840

Claim:
Circuitry comprising: a radio frequency power amplifier adapted to receive and amplify a radio frequency input signal to provide a radio frequency transmit signal using an envelope power supply signal; and an envelope tracking power supply adapted to: provide the envelope power supply signal, which has switching ripple; operate in one of a normal switching ripple mode and a modified switching ripple mode; during the modified switching ripple mode, the envelope power supply signal has modified switching ripple; when the modified switching ripple is required, operate in the modified switching ripple mode; and during the modified switching ripple mode, modify a frequency of the switching ripple, wherein: the radio frequency transmit signal falls within one of a plurality of radio frequency communications bands; the plurality of radio frequency communications bands comprises a first radio frequency communications band, which is about adjacent to a second radio frequency communications band; and during the modified switching ripple mode, the one of the plurality of radio frequency communications bands is the first radio frequency communications band.