Amplifier having a virtual ground and method thereof
First Claim
1. An amplifier comprising:
- a first modulation circuit having an input for receiving a first input signal, and an output for providing a first modulated output signal, the first modulated output signal corresponding to the first input signal;
a second modulation circuit having an input for receiving a second input signal, and an output for providing a second modulated output signal, the second modulated output signal corresponding to the second input signal;
a third modulation circuit having an input for receiving a third input signal, and an output for providing a third modulated output signal, the third modulated output signal corresponding to the third input signal and for providing a virtual ground;
a first amplifier circuit coupled to the outputs of the first and third modulation circuits, the first amplifier circuit for driving a first load; and
a second amplifier circuit coupled to the outputs of the second and third modulation circuits, the second amplifier circuit for driving a second load.
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Accused Products
Abstract
An amplifier comprises first, second, and third modulators. The first modulator includes an input for receiving a first input signal, and an output for providing a first modulated output signal corresponding to the first input signal. The second modulator includes an input for receiving a second input signal, and an output for providing a second modulated output signal corresponding to the second input signal. The third modulator has an input for receiving a third input signal, and an output for providing a third modulated output signal corresponding to the third input signal and for providing a virtual ground. A first amplifier circuit is coupled to the outputs of the first and third modulators for driving a first load. A second amplifier circuit is coupled to the outputs of the second and third modulators for driving a second load.
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Citations
20 Claims
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1. An amplifier comprising:
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a first modulation circuit having an input for receiving a first input signal, and an output for providing a first modulated output signal, the first modulated output signal corresponding to the first input signal; a second modulation circuit having an input for receiving a second input signal, and an output for providing a second modulated output signal, the second modulated output signal corresponding to the second input signal; a third modulation circuit having an input for receiving a third input signal, and an output for providing a third modulated output signal, the third modulated output signal corresponding to the third input signal and for providing a virtual ground; a first amplifier circuit coupled to the outputs of the first and third modulation circuits, the first amplifier circuit for driving a first load; and a second amplifier circuit coupled to the outputs of the second and third modulation circuits, the second amplifier circuit for driving a second load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An amplifier comprising:
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a first sigma delta modulator having an input for receiving a first input signal, and an output for providing a first pulse density modulated output signal, the first pulse density modulated output signal corresponding to the first input signal; a second sigma delta modulator having an input for receiving a second input signal, and an output for providing a second pulse density modulated output signal, the second pulse density modulated output signal corresponding to the second input signal; a third sigma delta modulator having an input for receiving a third input signal, and an output for providing a third pulse density modulated output signal, the third pulse density modulated output signal corresponding to the third input signal and for providing a virtual ground; a first H-bridge circuit coupled to the outputs of the first and third sigma delta modulators, the first H-bridge circuit for driving a first load; and a second H-bridge circuit coupled to the outputs of the second and third sigma delta modulators, the second H-bridge circuit for driving a second load. - View Dependent Claims (12, 13, 14, 15)
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16. A method for amplifying first and second stereo audio signals, the method comprising:
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modulating the first stereo audio signal to provide a first modulated stereo signal; modulating the second stereo audio signal to provide a second modulated stereo signal; modulating a third signal to provide a third modulated signal, the third modulated signal for providing a virtual ground; amplifying the first modulated stereo signal to drive a first load, wherein the first load is coupled to receive the first modulated stereo signal and the virtual ground; and amplifying the second modulated stereo signal to drive a second load, wherein the second load is coupled to receive the second modulated stereo signal and the virtual ground. - View Dependent Claims (17, 18, 19, 20)
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Specification