CLASS D AMPLIFIER
First Claim
1. A class D amplifier, comprising:
- a PWM circuit for transferring an analog signal into a PWM signal;
a buffer amplifying circuit, electrically connected to the PWM circuit, for amplifying the PMW signal and generating an amplified signal;
a low-pass filter, electrically connected to the buffer amplifying circuit, for filtering a high frequency component out from the amplified signal to generate a filtered signal, and then transmitting the filtered signal to a loading of the class D amplifier;
a first current source, electrically connected to a feedback node in the PWM circuit, for providing a first current flowing into the feedback node;
a second current source, electrically connected to the feedback node, for providing a second current flowing out from the feedback node; and
a control circuit, electrically connected to the first current source and the second current source, for selectively turning on or off the first current source and the second current source.
1 Assignment
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Accused Products
Abstract
A class D amplifier including a PWM circuit, a buffer amplifying circuit, a low-pass filter, and two current sources is provided. The PWM circuit transfers an analog signal into a PWM signal. The buffer amplifying circuit amplifies the PMW signal and generates an amplified signal. The low-pass filter will filter high frequency components out from the amplified signal and then transmit the filtered signal to a loading of the class D amplifier. The two current sources provide currents flowing into and out from a feedback node in the PWM circuit, respectively. The charging and discharging provided by the two current sources can generate a triangular signal for the PWM circuit.
12 Citations
12 Claims
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1. A class D amplifier, comprising:
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a PWM circuit for transferring an analog signal into a PWM signal; a buffer amplifying circuit, electrically connected to the PWM circuit, for amplifying the PMW signal and generating an amplified signal; a low-pass filter, electrically connected to the buffer amplifying circuit, for filtering a high frequency component out from the amplified signal to generate a filtered signal, and then transmitting the filtered signal to a loading of the class D amplifier; a first current source, electrically connected to a feedback node in the PWM circuit, for providing a first current flowing into the feedback node; a second current source, electrically connected to the feedback node, for providing a second current flowing out from the feedback node; and a control circuit, electrically connected to the first current source and the second current source, for selectively turning on or off the first current source and the second current source. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A class D amplifier, comprising:
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a PWM circuit for transferring a differential analog single into a differential PWM signal; a buffer amplifying circuit, electrically connected to the PWM circuit, for amplifying the differential PWM signal and generating a differential amplified signal; a low-pass filter circuit, electrically connected to the buffer amplifying circuit, for filtering a high frequency signal component out from the differential amplified signal to generate a differential filtered signal, and then transmitting the differential filtered signal to a loading of the class D amplifier; a first current source, electrically connected to a feedback node in the PWM circuit, for providing a first current flowing into the feedback node; a second current source, electrically connected to the feedback node, for providing a second current flowing out from the feedback node; and a control circuit, electrically connected to the first current source and the second current source, for selectivity turning on or off the first current source and the second current source. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification