Low power output stage
First Claim
Patent Images
1. A method of controlling a plurality of switches that are coupled, comprising:
- determining at least one difference associated with time durations of different levels of an input signal over at least one period of time; and
generating a plurality of control signals based on the at least one difference, wherein the plurality of control signals independently control the switches.
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Abstract
Power consumption of an output stage such as a class-D output stage may depend on the amplitude and the activity of the signal being output. Here, control signals may be generated to independently control coupled switches of the output stage and to provide a tri-state control scheme for the output stage. These control signals may be generated based on durations of different levels of an input signal over one or more periods of time.
171 Citations
91 Claims
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1. A method of controlling a plurality of switches that are coupled, comprising:
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determining at least one difference associated with time durations of different levels of an input signal over at least one period of time; and generating a plurality of control signals based on the at least one difference, wherein the plurality of control signals independently control the switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An apparatus for controlling a plurality of switches that are coupled, comprising:
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a determiner adapted to determine at least one difference associated with time durations of different levels of an input signal over at least one period of time; and a signal generator adapted to generate a plurality of control signals based on the at least one difference, wherein the plurality of control signals independently control the switches. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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59. An apparatus for controlling a plurality of switches that are coupled, comprising:
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means for determining at least one difference associated with time durations of different levels of an input signal over at least one period of time; and means for generating a plurality of control signals based on the at least one difference, wherein the plurality of control signals independently control the switches. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87)
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88. A computer-program product stored on the readable medium for controlling a plurality of switches that are coupled, comprising:
computer-readable medium comprising codes executable by at least one computer to; determine at least one difference associated with time durations of different levels of an input signal over at least one period of time; and generate a plurality of control signals based on the at least one difference, wherein the plurality of control signals independently control the switches.
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89. A headset for wireless communication, comprising:
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a plurality of switches that are coupled; a comparator adapted to determine at least one difference associated with time durations of different levels of an input signal over at least one period of time; a signal generator adapted to generate a plurality of control signals based on the at least one difference, wherein the plurality of control signals independently control the switches; and a transducer, wherein the switches are coupled to alternately provide power to the transducer.
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90. A watch for wireless communication, comprising:
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a plurality of switches that are coupled; a comparator adapted to determine at least one difference associated with time durations of different levels of an input signal over at least one period of time; a signal generator adapted to generate a plurality of control signals based on the at least one difference, wherein the plurality of control signals independently control the switches; and a transducer, wherein the switches are coupled to alternately provide power to the transducer.
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91. A medical device for wireless communication, comprising:
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a plurality of switches that are coupled; a comparator adapted to determine at least one difference associated with time durations of different levels of an input signal over at least one period of time; a signal generator adapted to generate a plurality of control signals based on the at least one difference, wherein the plurality of control signals independently control the switches; and a transducer, wherein the switches are coupled to alternately provide power to the transducer.
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Specification