Apple Inc.

Mohammad Reza Ghajar

Wassim El-Hassan

Srinivasa Yasasvy Sateesh Bhamidipati

Vineet Nayak

Robert S Sorensen

Huanyu Chen

Gurusubrahmaniyan Subrahmaniyan Radhakrishnan

The representative embodiments discussed in the present disclosure relate to techniques in which the operating characteristics (e.g., gain and/or efficiency) of a power amplifier in a transmitter may be regulated according to an operation mode of the transmitter. More specifically, in some embodiments, different look-up tables (LUTs) may be employed for each mode of operation to suitably adjust the supply voltage to the power amplifier and modulate its operating characteristics based on power input to the power amplifier. Further, in some embodiments, a method to calibrate a LUT for uplink carrier aggregation (ULCA) operation mode of the transmitter may be employed to populate a LUT used to suitably adjust the supply voltage during ULCA.

Dynamic look up table measurements for transmitter with envelope tracking systems

An electronic device includes an antenna configured to receive a wireless transmission. The wireless transmission includes noise and data to be received. The electronic device includes a signal splitter that splits the wireless transmission into a first signal and a second signal. The electronic device includes a filter configured to filter the data to be received in the first signal. Furthermore, the electronic device includes merging circuitry configured to subtract the first signal from the second signal to reduce the noise in the second signal.

Noise cancellation

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Santa Clara, CA, United States of America

Mohammad Reza Ghajar