Apple patents amplifier circuit that controls signal feedback
Apple has filed a patent for an electronic circuit design that amplifies electrical signals using a specific feedback loop. The system uses multiple amplifier stages to boost signals and connects the output back to the input based on voltage levels to manage the flow.
In the filing’s own words
An amplifier circuit with controlled positive feedback is disclosed. First and second amplifier circuits of the amplifier circuit may amplify respective signals of a differential signal to generate corresponding input signals. Third and fourth amplifier circuits of the amplifier circuit may amplify corresponding ones of the input signals to generate corresponding output signals. First and second feedback circuits included in the amplifier circuit may, based on respective voltage levels of the output signals, couple an output terminal of the third amplifier circuit to the input terminal of the fourth amplifier circuit, and couple an output terminal of the fourth amplifier circuit to an input of third amplifier circuit.
What exactly they claim (claim 1)
1. An apparatus, comprising: a first amplifier circuit configured to amplify a first signal of a differential signal to generate a first input signal; a second amplifier circuit configured to amplify a second signal of the differential signal to generate a second input signal; a third amplifier circuit configured to amplify the first input signal to generate a first output signal; a fourth amplifier circuit configured to amplify the second input signal to generate a second output signal; a first feedback circuit configured, based on a first voltage level of the first output signal, to couple the first output signal to an input terminal of the fourth amplifier circuit; and a second feedback circuit configured, based on a second voltage level of the second output signal, to couple the second output signal to an input terminal of the third amplifier circuit.
Facts
- Company
- Apple (Apple Inc.)
- Official title
- AMPLIFIER CIRCUIT WITH CONTROLLED POSITIVE FEEDBACK
- Publication number
- US20260332112A1
- Application number
- 19180915
- Filed
- Apr 16, 2025
- Published
- Oct 22, 2026
- Inventors
- 3
- Claims
- 20
Classified under
H03F 3/45475 Electricity & electronicsG06F 1/08 Physics & computingMore from Apple in Chips & hardware
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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.