Audio amplifier
AssigneeNXP B.V.
InventorJan Paulus Freerk Huijser
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Abstract
An audio amplifier (3) for a mobile telephone (1) is disclosed. The audio amplifier (3) comprises first and second output stages (11, 12), each for coupling to a respective one of first and second loudspeakers (4, 5), and switching circuitry (10) adapted to respond to a switching signal by switching an output signal from a common input stage (7, 8, 9) to the first output stage (11) when the switching signal is in a first state and to the second output stage (12) when the switching signal is in a second state.
Claims14
An audio amplifier for a mobile telephone, the audio amplifier comprising:
- first and second output stages, each output stage configured to be coupled to a respective one of first and second loudspeakers;
- switching circuitry configured to respond to a switching signal by switching an output signal from a common input stage to the first output stage when the switching signal is in a first state and to the second output stage when the switching signal is in a second state;
- and
- a command decoder configured to monitor clock and data inputs to the common input stage.
An audio amplifier for a mobile telephone, the audio amplifier comprising:
- first and second output stages, each output stage configured to be coupled to a respective one of first and second loudspeakers, and
- switching circuitry configured to respond to a switching signal by switching an output signal from a pulse width modulator to the first output stage when the switching signal is in a first state and to the second output stage when the switching signal is in a second state, whereby the output signal is a pulse width modulated output signal for driving either the first output stage or the second output stage, and wherein the pulse width modulator comprises a slew rate limiter for limiting the slew rate of the pulse width modulated output signal in response to a slew rate limiter enable signal.
Dependencies are inferred from the claim text.