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US 2016/0255451 A1Published application
Nonlinear power supply ramping for pop-click noise reduction
AssigneeQUALCOMM Incorporated
InventorsMustafa Keskin, Khalid Junaid Sidiqi, Derick Hugunin, James Ian Jaffee, Louis Dominic Oliveira
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Abstract
A nonlinear power supply generator is provided that nonlinearly changes a power supply voltage for a circuit during power up of the circuit to reduce high-frequency noise in an output signal from the circuit.
Claims20
A system comprising:
- a driver configured to drive an output signal;
- and
- a nonlinear power supply voltage generator configured to nonlinearly change at least one power supply voltage for the driver from a first DC value during a power-off state for the driver to a second DC value during an active state for the driver.
A method, comprising:
- during a powered-off state for an audio driver having a positive power supply node for carrying a positive power supply voltage, discharging the positive power supply voltage to a first DC value;
- and
- powering on the audio driver from the off state by nonlinearly increasing the positive power supply voltage from the first DC value to a second DC value.
A system, comprising:
- an audio driver configured to drive an output signal;
- and
- means for nonlinearly changing a positive power supply voltage for the audio driver from a first DC value during a power-off state for the audio driver to a second DC value during an active state for the audio driver.
Dependencies are inferred from the claim text.