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Apple patents stacked amplifier design to clean up wireless signals

Apple describes a circuit design for wireless transmitters where multiple amplifier stages share a single control signal to save space. The system uses extra circuits to correct distortions, ensuring the signal sent out is clean and accurate.

Why it mattersThis is a routine hardware improvement that helps make wireless components more efficient and compact.

In the filing’s own words

This disclosure is generally directed to linearization circuitry of a multi-stage amplifier of wireless transmission circuitry. The amplifier may include multiple amplifier stages. The amplifier stages are cascaded such that an output signal of an amplifier stage may be input by a subsequent amplifier stage. Moreover, the amplifier stages are stacked such that the amplifier stages share (e.g., serially receive) a bias signal (e.g., a single bias signal). The linearization circuitry may include at least one operational transconductance amplifier (OTA) and at least one gain correction circuit to reduce a voltage and/or current of undesired signals that may be present based on non-linear behaviors of one or more of the amplifier stages.

What exactly they claim (claim 1)

1. An electronic device comprising: an antenna; and an amplifier comprising: a first switching device coupled to an amplifier input terminal of the amplifier; a second switching device coupled to the first switching device and the antenna; and a transconductance amplifier having a first input terminal, a second input terminal, and an output terminal, the first input terminal coupled to a controlled voltage source, and the output terminal coupled to the first switching device, the second switching device, and the second input terminal.

Facts

Company
Apple (Apple Inc.)
Official title
STACKED AMPLIFIER WITH LINEARIZATION SCHEME
Publication number
US20260280495A1
Application number
19082092
Filed
Mar 17, 2025
Published
Sep 17, 2026
Inventors
4
Claims
20

Classified under

H03F 1/3211 Electricity & electronicsH03F 3/245 Electricity & electronicsH03F 3/45475 Electricity & electronicsH03G 3/3042 Electricity & electronicsH03F 2200/294 Electricity & electronics
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.