Invention Grant
- Patent Title: Envelope tracking circuit
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Application No.: US15966378Application Date: 2018-04-30
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Publication No.: US10432145B2Publication Date: 2019-10-01
- Inventor: Nadim Khlat
- Applicant: Qorvo US, Inc.
- Applicant Address: US NC Greensboro
- Assignee: Qorvo US, Inc.
- Current Assignee: Qorvo US, Inc.
- Current Assignee Address: US NC Greensboro
- Agency: Withrow & Terranova, P.L.L.C.
- Main IPC: H03F3/19
- IPC: H03F3/19 ; H03F1/02 ; G01R1/30 ; H03F3/189 ; H03F3/20

Abstract:
An envelope tracking (ET) circuit is provided. In the ET circuit, a number of amplifier circuits are configured to amplify a radio frequency (RF) signal simultaneously to generate multiple RF transmit signals for transmission in a formed RF beam. The RF signal is pre-modulated into respective phase and amplitude terms such that the multiple RF transmit signals can be linearly combined at a receiver(s). A signal processing circuit is configured to determine a combined distortion term in the multiple RF transmit signals. Accordingly, the signal processing circuit pre-distorts the RF signal with a distortion correction term to offset the combined distortion term in the RF transmit signals. By introducing the distortion correction term in the RF signal, it is possible to restore linear coherency among the RF transmit signals without compromising efficiency and/or increasing heat dissipation of the amplifier array(s).
Public/Granted literature
- US20190222181A1 ENVELOPE TRACKING CIRCUIT Public/Granted day:2019-07-18
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