US 12,603,620 B2Granted

Class-D amplifier

AssigneeYamaha Corporation

InventorsShinya Mizoshiri, Masao Noro

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Abstract

A class-D amplifier that amplifies an input signal comprises a control circuit configured to generate a control signal that varies in accordance with a level of the input signal, a first generating circuit configured to generate a first pulse, and a second generating circuit configured to generate a second pulse. A pulse width of the first pulse becomes narrower as the signal level of the input signal becomes smaller, and the pulse width of the first pulse becomes wider as an instantaneous magnitude of the input signal becomes larger. A pulse width of the second pulse becomes narrower as the signal level of the input signal becomes smaller, and the pulse width of the second pulse becomes wider as an instantaneous magnitude of the input signal becomes smaller.

Claims13

Dependent claims

A class-D amplifier that amplifies an input signal, comprising:

a control circuit configured to generate a control signal that varies in accordance with a level of the input signal;
a first generating circuit configured to generate a first pulse, a pulse width of the first pulse becoming narrower in accordance with the control signal as a signal level of the input signal becomes smaller, the pulse width of the first pulse becoming wider in accordance with the control signal as an instantaneous magnitude of the input signal becomes larger;
and
a second generating circuit configured to generate a second pulse, a pulse width of the second pulse becoming narrower in accordance with the control signal as a signal level of the input signal becomes smaller, the pulse width of the second pulse becoming wider in accordance with the control signal as an instantaneous magnitude of the input signal becomes smaller,
wherein a high-gain area in which the first generating circuit generates the first pulse and the second generating circuit generates the second pulse, in an area in which the input signal varies, becomes wider in accordance with the control signal as the signal level of the input signal becomes larger.

2 more elements

A class-D amplifier that amplifies an input signal, comprising:

a control circuit configured to generate a control signal that varies in accordance with a level of the input signal;
a first generating circuit configured to generate a first pulse, a pulse width of the first pulse becoming narrower in accordance with the control signal as a signal level of the input signal becomes smaller, the pulse width of the first pulse becoming wider in accordance with the control signal as an instantaneous magnitude of the input signal becomes larger;
and
a second generating circuit configured to generate a second pulse, a pulse width of the second pulse becoming narrower in accordance with the control signal as a signal level of the input signal becomes smaller, the pulse width of the second pulse becoming wider in accordance with the control signal as an instantaneous magnitude of the input signal becomes smaller,
wherein the control circuit is configured to vary the control signal so as to follow rise of the signal level of the input signal without delay and follow fall of the signal level of the input signal with a predetermined time constant.

2 more elements

A class-D amplifier that amplifies an input signal, comprising:

a control circuit configured to generate a control signal that varies in accordance with a level of the input signal;
a first generating circuit configured to generate a first pulse, a pulse width of the first pulse becoming narrower in accordance with the control signal as a signal level of the input signal becomes smaller, the pulse width of the first pulse becoming wider in accordance with the control signal as an instantaneous magnitude of the input signal becomes larger;
and
a second generating circuit configured to generate a second pulse, a pulse width of the second pulse becoming narrower in accordance with the control signal as a signal level of the input signal becomes smaller, the pulse width of the second pulse becoming wider in accordance with the control signal as an instantaneous magnitude of the input signal becomes smaller,
wherein the control signal generated by the control circuit becomes smaller as the signal level of the input signal becomes larger.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/126,751Filed 27 Mar 2023 · continuation
Priority: JP 2020-16166728 Sep 2020
Published: US 2023/0261619 A117 Aug 2023
Granted: 14 Apr 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03F 3/217
With semiconductor devices only: class D power amplifiers; Switching amplifiers
H03F 3/2173
Class D power amplifiers; Switching amplifiers: of the bridge type
H03F 1/0205
Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation: in transistor amplifiers
H03F 3/183
Low-frequency amplifiers, e.g. audio preamplifiers: with semiconductor devices only

Family

PCT/JP2021/034128Parent of this continuation · filed 16 Sep 2021
US 2023/0261619 A1Pre-grant publication · published 17 Aug 2023
US 12,603,620 B2This patent

From the US filing history. Foreign family members aren’t listed.

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