Patent attributes
An envelope tracking system is disclosed having an envelope tracking integrated circuit (ETIC) with a first tracker having a first supply output and a second tracker having a second supply output, wherein the ETIC has a first mode in which only one of the first and second trackers supplies voltage and a second mode in which the first and second trackers both supply voltage. A first notch filter is coupled to the first supply output and a second notch filter is coupled to the second supply output. A mode switch coupled between the first supply output and the second supply output is configured to couple the first notch filter and the second notch filter in parallel in the first mode and open the mode switch to decouple the first notch filter from the second notch filter in the second mode in response to first and second switch control signals, respectively.
