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|1. (WO2018182880) FEED-FORWARD ENVELOPE TRACKING|
|Applicants:||INTEL IP CORPORATION
|Title:||FEED-FORWARD ENVELOPE TRACKING|
An envelope tracking system (100) for controlling a power amplifier supply voltage includes envelope circuitry (150) and a feed forward digital to analog converter (DAC) circuitry (160). The envelope circuitry (150) is configured to generate a target envelope signal based on a selected power amplifier supply voltage. The feed forward DAC circuitry (160) includes a voltage source circuitry (170) and a selector circuitry (180). The voltage source circuitry (170) is configured to generate a plurality of voltages. The selector circuitry (180) is configured to select one of the plurality of voltages based at least on the target envelope signal. The feed forward DAC circuitry (160) is configured to provide the selected voltage to a supply voltage input of a power amplifier (PA) that amplifies a radio frequency (RF) transmit signal.