Class-D amplifier
AssigneeYamaha Corporation
InventorsYoshiro Miyake, Masao Noro
Life of this patent
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Abstract
A single printed-circuit board of a class-D amplifier includes an input ground, an output ground, an input amplifying circuit, a modulation circuit, an output amplifying circuit, and an output filter, a solid pattern, a first feedback circuit, and a second feedback circuit. The solid pattern of the output ground extends into all regions of the input amplifying circuit, the modulation circuit, the output amplifying circuit and the output filter. The first feedback circuit executes a feedback where a voltage at a first connecting point is negatively fed back to an inverting input of the input amplifying circuit. The second feedback circuit executes a feedback where a voltage at a second connecting point is negatively fed back to a non-inverting input of the input amplifying circuit.
Claims9
A class-D amplifier comprising:
- a single printed-circuit board including:
- an input ground configured to provide a first reference voltage;
- an output ground configured to provide a second reference voltage;
- an input amplifying circuit configured to amplify an input signal based on the input ground and including an inverting input and a non-inverting input;
- a modulation circuit configured to output a pulse that is modulated based on the amplified input signal;
- an output amplifying circuit configured to amplify the modulated pulse based on the output ground;
- an output filter configured to pass a first low-frequency component of the amplified modulated pulse to generate an output signal;
- a solid pattern of the output ground that extends into all regions of the input amplifying circuit, the modulation circuit, the output amplifying circuit and the output filter;
- a first feedback circuit configured to execute a first negative feedback where a voltage, at a first connecting point with which a first end of a load connects in the output filter, is negatively fed back to the inverting input of the input amplifying circuit;
- and
- a second feedback circuit configured to execute a second negative feedback where a voltage, at a second connecting point with which a second end of the load connects in the solid pattern, is negatively fed back to the non-inverting input of the input amplifying circuit.
A class-D amplifier comprising:
- a single printed-circuit board including:
- an input ground configured to provide a first reference voltage;
- an output ground configured to provide a second reference voltage;
- an input amplifying circuit configured to amplify an input signal based on the input ground;
- a modulation circuit configured to output a pulse that is modulated based on the amplified input signal, a switching frequency of the output pulse being higher than 1.7 MHz;
- an output amplifying circuit configured to amplify the modulated pulse based on the output ground;
- an output filter configured to pass a first low-frequency component of the amplified modulated pulse to generate an output signal;
- and
- a solid pattern of the output ground that extends into all regions of the input amplifying circuit, the modulation circuit, the output amplifying circuit and the output filter.
Dependencies are inferred from the claim text.