US 12,003,222 B2Granted

Methods and apparatus to generate a modulation protocol to output audio

AssigneeTexas Instruments Incorporated

InventorsYinglai Xia, Yogesh Ramadass

Life of this patent

Estimating the term…

Loading patent…

Abstract

Methods, apparatus, systems, and articles of manufacture are disclosed to generate a modulation protocol to output audio. An example apparatus includes a modulation circuit including a first input, a second input, a first output, and a second output; a first gate coupled to the first output of the modulation circuit; a second gate coupled to the second output of the modulation circuit; a first multiplexer including a first input coupled to the first output of the modulation circuit, a second input coupled to the output of the second gate, and an output coupled to a first switch; and a second multiplexer including a first input coupled to the second output of the modulation circuit, a second input coupled to the output of the first gate, and an output coupled to a second switch.

Claims26

Dependent claims

An apparatus comprising:

a control circuit having first and second control inputs, first and second feedback inputs, and first and second control outputs, the control circuit including:
a control signal generation circuit having first and second inputs, a first output, an inverted first output, a second output, and an inverted second output, the first input coupled to the first control input, the second input coupled to the second control input;
a first multiplexer having first and second multiplexer inputs, a first multiplexer control input, and a first multiplexor output, the first multiplexer input coupled to the first output, the second multiplexer input coupled to the inverted second output, the first multiplexer control input coupled to the first and second feedback inputs, and the first multiplexer output coupled to the first control output;
and
a second multiplexer having third and fourth multiplexer inputs, a second multiplexer control input, and a second multiplexor output, the third multiplexer input coupled to the second output, the fourth multiplexer input coupled to the inverted first output, the second multiplexer control input coupled to the first and second feedback inputs, and the second multiplexer output coupled to the second control output;
a first power stage having a first power stage input and a first power stage output, the first power stage input coupled to the first control output, and the first power stage output coupled to the first feedback input;
and
a second power stage having a second power stage input and a second power stage output, the second power stage input coupled to the second control output, and the second power stage output coupled to the second feedback input.

5 more elements

An apparatus comprising:

a first power stage having a first power stage input and a first power stage output;
a second power stage having a second power stage input and a second power stage output;
a control circuit including a modulator circuit, the control circuit having a first control input, a second control input, a first feedback input, a second feedback input, a first control output, and a second control output, the first feedback input coupled to the first power stage output, the second feedback input coupled to the second power stage output, the first control output coupled to the first power stage input;
a switch coupled between the second control output and the second power stage input, the switch having a switch control terminal;
and
a mode detector having a first detector output and a second detector output, the first detector output coupled to the switch control terminal, and the second detector output coupled to the second power stage output.

3 more elements

A method comprising:

receiving a first input signal;
receiving a second input signal;
receiving a first feedback signal from a first output of a first power stage, the first power stage having a first power stage input;
receiving a second feedback signal from a second output of a second power stage, the second power stage having a second power stage input;
generating a first control signal and an inverted version of the first control signal responsive to the first input signal and the second input signal;
generating a second control signal and an inverted version of the second control signal responsive to the first input signal and the second input signal;
responsive to at least one of the first feedback signal or the second feedback signal:
selecting one of the first control signal or the inverted version of the second control signal;
and
selecting one of the second control signal or the inverted version of the first control signal;
providing the selected one of the first control signal or the inverted version of the second control signal at the first power stage input;
and
providing the selected one of the second control signal or the inverted version of the first control signal at the second power stage input.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/402,264Filed 13 Aug 2021
Published: US 2023/0049670 A116 Feb 2023
Granted: 4 Jun 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H03F 3/2173
Class D power amplifiers; Switching amplifiers: of the bridge type
H03F 3/2178
Class D power amplifiers; Switching amplifiers: using more than one switch or switching amplifier in parallel or in series
H03F 1/3205
Modifications of amplifiers to reduce non-linear distortion: in field-effect transistor amplifiers
H03F 3/183
Low-frequency amplifiers, e.g. audio preamplifiers: with semiconductor devices only

Family

US 2023/0049670 A1Pre-grant publication · published 16 Feb 2023
US 12,003,222 B2This patent

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

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key