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US 11,881,826 B2Granted
Audio amplifier circuitry
AssigneeCirrus Logic, Inc.
InventorsDavid P. Singleton, Andrew J. Howlett, John B. Bowlerwell
Life of this patent
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Abstract
The present disclosure relates to circuitry comprising audio amplifier circuitry for receiving an audio signal to be amplified; and first and second output nodes for outputting first and second differential output signals. The circuitry further comprises common mode buffer circuitry configured to receive a common mode voltage and to selectively output the common mode voltage to the first and second output nodes.
Claims22
A circuitry comprising:
- audio amplifier circuitry for receiving an audio signal to be amplified;
- and
- first and second output nodes for outputting first and second differential output signals, wherein the circuitry further comprises:
- common mode buffer circuitry;
- and
- low pass filter circuitry;
- wherein the low pass filter circuitry has an input that is configured to receive a common mode voltage and an output coupled to an input of the common mode buffer circuitry and the common mode buffer circuitry is configured to selectively output a common mode signal to the first and second nodes;
- and
- wherein the circuitry further comprises a low pass filter discharge switch coupled in parallel with a capacitance of the low pass filter circuitry, the low pass filter discharge switch being operable to discharge the capacitance.
6 more elements
An amplifier circuitry for receiving a signal to be amplified, the amplifier circuitry comprising:
- first and second output nodes for outputting first and second differential output signals;
- a dummy output stage;
- a dummy load configured to provide a resistive load to the dummy output stage;
- a dummy feedback path for selectively coupling an output of the dummy output stage to an input of the amplifier circuitry;
- a real output stage configured to drive an output transducer;
- and
- a real feedback path for selectively coupling an output of the real output stage to the input of the amplifier circuitry.
4 more elements
A circuitry comprising:
- first signal processing circuitry comprising first and second output signal paths for outputting a differential output signal;
- second circuitry configured to output a common mode signal to said first and second output signal paths;
- low pass filter circuitry having an output coupled to an input of the second circuitry to supply a common mode voltage to the second circuitry;
- and
- a low pass filter discharge switch coupled in parallel with a capacitance of the low pass filter circuitry, the low pass filter discharge switch being operable to discharge the capacitance.
2 more elements
A circuitry comprising:
- audio amplifier circuitry for receiving an audio signal to be amplified;
- and
- first and second output nodes for outputting first and second differential output signals, wherein the circuitry further comprises:
- common mode buffer circuitry;
- and
- low pass filter circuitry;
- wherein the low pass filter circuitry has an input that is configured to receive a common mode voltage and an output coupled to an input of the common mode buffer circuitry and the common mode buffer circuitry is configured to selectively output a common mode signal to the first and second output nodes;
- and
- wherein the circuitry further comprises first and second clamp switches coupled to the first and second output nodes respectively, to selectively couple the first and second output nodes to a reference voltage.
6 more elements
A circuitry comprising:
- audio amplifier circuitry for receiving an audio signal to be amplified;
- and
- first and second output nodes for outputting first and second differential output signals, wherein the circuitry further comprises:
- common mode buffer circuitry;
- and
- low pass filter circuitry;
- wherein the low pass filter circuitry has an input that is configured to receive a common mode voltage and an output coupled to an input of the common mode buffer circuitry and the common mode buffer circuitry is configured to selectively output a common mode signal to the first and second output nodes;
- and
- wherein the circuitry further comprises an output clamp switch coupled to the first and second output nodes, to selectively couple the first and second output nodes to each other.
6 more elements
A circuitry comprising:
- audio amplifier circuitry for receiving an audio signal to be amplified;
- and
- first and second output nodes for outputting first and second differential output signals, wherein the circuitry further comprises:
- common mode buffer circuitry;
- and
- low pass filter circuitry;
- wherein the low pass filter circuitry has an input that is configured to receive a common mode voltage and an output coupled to an input of the common mode buffer circuitry and the common mode buffer circuitry is configured to selectively output a common mode signal to the first and second output nodes;
- and
- wherein the amplifier circuitry comprises:
- a dummy output stage;
- a dummy feedback path for selectively coupling an output of the dummy output stage to an input of the amplifier unit;
- a real output stage;
- and
- a real feedback path for selectively coupling an output of the real output stage to the input of the amplifier unit.
11 more elements
Dependencies are inferred from the claim text.