Invention Grant
- Patent Title: Feed-forward envelope tracking
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Application No.: US16140991Application Date: 2018-09-25
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Publication No.: US10862428B2Publication Date: 2020-12-08
- Inventor: Stephan Henzler , Andreas Menkhoff , Thomas Eichler , Wolfgang Walthes , Alexander Belitzer , Yifan Wang
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Eschweiler & Potashnik, LLC
- Main IPC: H03F1/30
- IPC: H03F1/30 ; H03F1/02 ; H03F3/19 ; H03F3/21 ; H02M3/07 ; H03M1/66 ; H03F3/189 ; H03F3/24 ; H03F3/68 ; H02M3/158

Abstract:
An envelope tracking system for controlling a power amplifier supply voltage includes envelope circuitry and a feed forward digital to analog converter (DAC) circuitry. The envelope circuitry is configured to generate a target envelope signal based on a selected power amplifier supply voltage. The feed forward DAC circuitry includes a voltage source circuitry and a selector circuitry. The voltage source circuitry is configured to generate a plurality of voltages. The selector circuitry is configured to select one of the plurality of voltages based at least on the target envelope signal. The feed forward DAC circuitry is configured to provide the selected voltage to a supply voltage input of a power amplifier that amplifies a radio frequency (RF) transmit signal.
Public/Granted literature
- US20190036486A1 FEED-FORWARD ENVELOPE TRACKING Public/Granted day:2019-01-31
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