Output drivers for audio amplifiers
AssigneeSkyworks Solutions, Inc.
InventorTaehwan OH
Life of this patent
Estimating the term…
Abstract
An output driver can include a first driver circuit configured to operate with a first supply voltage and generate an output signal having an amplitude in a first range, and a second driver circuit configured to operate with a second supply voltage and generate an output signal having an amplitude in a second range. The output driver can further include a controller configured to operate any one of the first and second driver circuits, such that an output signal of the output driver has an amplitude in an overall range that includes the first and second ranges, and a switch circuit implemented to isolate one driver circuit from another driver circuit when the driver circuit is inactive and the other driver circuit is active.
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A semiconductor die comprising:
- a substrate;
- and
- an audio amplifier implemented on the substrate, the audio amplifier including a multi-level output driver having a first driver circuit configured to operate with a first supply voltage and generate an output signal having an amplitude in a first range, a second driver circuit configured to operate with a second supply voltage and generate an output signal having an amplitude in a second range, and a third driver circuit configured to operate with a third supply voltage and generate an output signal having an amplitude in a third range, the audio amplifier further including a controller configured to operate any one of the first, second and third driver circuits, such that an output signal of the output driver has an amplitude in an overall range that includes the first, second and third ranges, the audio amplifier further including a switch circuit implemented to isolate one driver circuit from another driver circuit when the driver circuit is inactive and the other driver circuit is active, and the supply voltage of the driver circuit is less than the supply voltage of the other driver circuit.
A module comprising:
- a packaging substrate;
- and
- an audio amplifier implemented on the packaging substrate, the audio amplifier including a multi-level output driver having a first driver circuit configured to operate with a first supply voltage and generate an output signal having an amplitude in a first range, a second driver circuit configured to operate with a second supply voltage and generate an output signal having an amplitude in a second range, and a third driver circuit configured to operate with a third supply voltage and generate an output signal having an amplitude in a third range, the audio amplifier further including a controller configured to operate any one of the first, second and third driver circuits, such that an output signal of the output driver has an amplitude in an overall range that includes the first, second and third ranges, the audio amplifier further including a switch circuit implemented to isolate one driver circuit from another driver circuit when the driver circuit is inactive and the other driver circuit is active, and the supply voltage of the driver circuit is less than the supply voltage of the other driver circuit.
A wireless device comprising:
- an antenna for receiving a wireless signal;
- an audio amplifier configured to amplify a digital signal representative of the wireless signal, the audio amplifier including a multi-level output driver having a first driver circuit configured to operate with a first supply voltage and generate an output signal having an amplitude in a first range, a second driver circuit configured to operate with a second supply voltage and generate an output signal having an amplitude in a second range, and a third driver circuit configured to operate with a third supply voltage and generate an output signal having an amplitude in a third range, the audio amplifier further including a controller configured to operate any one of the first, second and third driver circuits, such that an output signal of the output driver has an amplitude in an overall range that includes the first, second and third ranges, the audio amplifier further including a switch circuit implemented to isolate one driver circuit from another driver circuit when the driver circuit is inactive and the other driver circuit is active, and the supply voltage of the driver circuit is less than the supply voltage of the other driver circuit;
- and
- a speaker in communication with the multi-level output driver of the audio amplifier and configured to generate sound waves based on the output signal of the multi-level output driver.
Dependencies are inferred from the claim text.