Patent ID: 11923806
Assignee: QORVO US, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A radio frequency (RF) system comprising:
one or more RF power amplifiers configured to amplify an RF input signal based on an envelope tracking supply voltage to provide an RF output signal;
envelope tracking power supply circuitry coupled to the one or more RF power amplifiers and comprising:
envelope synchronization circuitry configured to adjust a target supply voltage to provide an adjusted target supply voltage, the envelope synchronization circuitry comprising:
a target voltage input at which the target voltage is provided;
an inverted target voltage input at which an inverted version of the target voltage is provided;
an operational amplifier comprising an inverting input, a non-inverting input coupled to a fixed potential, and an output at which the adjusted target supply voltage is provided;
a first adjustable resistor coupled between the target voltage input and the inverting input of the operational amplifier;
a second adjustable resistor coupled between the inverting input of the operational amplifier and the output of the operational amplifier;
a capacitor coupled between the inverting input and an intermediate node;
a first switch coupled between the intermediate node and the target voltage input; and
a second switch coupled between the inverted target voltage input and the intermediate node; and

envelope tracking modulator circuitry coupled to the envelope synchronization circuitry and configured to provide the envelope tracking supply voltage based on the adjusted target supply voltage.