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US 2011/0215867 A1Published application
Reducing pulse error distortion
AssigneeBose Corporation
InventorTimothy Sheen
Life of this patent
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Abstract
A class D amplifier that includes circuitry to apply a non-linear correction to pulse error distortion. The amplifier includes an output voltage controlling circuit, comprising at least two switches, controlled by a modulator; an output inductor, coupling the switching circuit to an output terminal; and correction circuitry to provide to the modulator a correction signal characterized by a non-linearity. The correction circuitry includes a current sensor that senses the current from the output inductor to the output terminal.
Claims7
An amplifier comprising:
- an output voltage controlling circuit, comprising at least two switches, controlled by a modulator;
- an output inductor, coupling the switching circuit to an output terminal;
- and
- correction circuitry to provide to the modulator a correction signal characterized by a non-linearity, comprising a current sensor that senses the current from the output inductor to the output terminal.
1 more element
A method for operating an amplifier, comprising:
- opening and closing a plurality of switches according to a duty cycle to control the voltage provide to an output terminal;
- measuring current through an inductor to the output terminal;
- sensing the current through the inductor to the output terminal to provide a sensed current measurement;
- based on the sensed current measurement, applying a non-linear correction signal to the duty cycle.
1 more element
Dependencies are inferred from the claim text.