Patent ID: 9654055
Date: 2017-05-16
CPC Classifications: H02M,H03F,Y02B

Claim:
1. A radio-frequency power amplifier with envelope tracking, comprising a power RF amplifying device for amplifying a RF signal and a switching DC/DC converter for providing said power RF amplifying device with a DC power supply at a voltage level proportional to an envelope of said RF signal; wherein said switching DC/DC converter has a reversed buck topology, wherein said power RF amplifying device is connected between a first conductor which, during operation, is maintained at a constant positive voltage with respect to a ground reference point, and a second conductor serving as a local voltage reference; and wherein said switching DC/DC converter is connected for setting the voltage level of said second conductor with respect to said ground reference point at a positive value which is lower than the voltage of said first conductor, and in that the radio-frequency power amplifier further comprises a first blocking capacitor connected between an output port of said power RF amplifying device and an RF-load, and a second blocking capacitor connected between an input port of said RF amplifying device and an RF input signal source, and wherein said switching DC/DC converter comprises a switching device having a first terminal connected to said ground reference point and a second terminal connected to said second conductor through an inductor and to said first conductor through a rectifier, said rectifier being configured to allow current flow only from said switch to said first conductor, also comprising filter capacitor connected between said first conductor and said second conductor.