US 10,951,175 B2 · Envelope tracking circuit and related power amplifier apparatus

Abstract

An envelope tracking (ET) circuit and related power amplifier apparatus is provided. An ET power amplifier apparatus includes an ET circuit and a number of amplifier circuits. The ET circuit is configured to provide a number of ET modulated voltages to the amplifier circuits for amplifying concurrently a number of radio frequency (RF) signals. The ET circuit includes a target voltage circuit for generating a number of ET target voltages adapted to respective power levels of the RF signals and/or respective impedances seen by the amplifier circuits, a supply voltage circuit for generating a number of constant voltages, and an ET voltage circuit for generating the ET modulated voltages based on the ET target voltages and a selected one of the constant voltages. By employing a single ET circuit, it may be possible to reduce footprint and improve heat dissipation of the ET power amplifier apparatus.

Claims25

Dependent claims

An envelope tracking (ET) circuit comprising:

a supply voltage circuit configured to generate a plurality of constant voltages;
a target voltage circuit configured to generate a plurality of ET target voltages based on a reference target voltage;
and
an ET voltage circuit configured to:
receive the plurality of constant voltages from the supply voltage circuit;
receive the plurality of ET target voltages from the target voltage circuit;
and
generate a plurality of ET modulated voltages based on the plurality of ET target voltages and a selected constant voltage among the plurality of constant voltages.

5 more elements

An envelope tracking (ET) power amplifier apparatus comprising:

a plurality of amplifier circuits configured to amplify a radio frequency (RF) signal based on a plurality of ET modulated voltages, respectively;
and
an ET circuit coupled to the plurality of amplifier circuits and comprising:
a supply voltage circuit configured to generate a plurality of constant voltages;
a target voltage circuit configured to generate a plurality of ET target voltages based on a reference target voltage;
and
an ET voltage circuit configured to:
receive the plurality of constant voltages from the supply voltage circuit;
receive the plurality of ET target voltages from the target voltage circuit;
generate the plurality of ET modulated voltages based on the plurality of ET target voltages and a selected constant voltage among the plurality of constant voltages;
and
provide the plurality of ET modulated voltages to the plurality of amplifier circuits, respectively.

9 more elements

Dependencies are inferred from the claim text.

Envelope tracking circuit and related power amplifier apparatus

Life of this patent

Envelope tracking circuit and related power amplifier apparatus

Life of this patent

Abstract

Claims25