Quaternary/ternary modulation selecting circuit and associated method

Active Publication Date: 2019-09-19
ELITE SEMICON MEMORY TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Efficiency is a critical issue; a class D power amplifier is the most popular kind used in audio systems due to its higher efficiency compared to other kinds of amplifier.

Method used

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  • Quaternary/ternary modulation selecting circuit and associated method
  • Quaternary/ternary modulation selecting circuit and associated method
  • Quaternary/ternary modulation selecting circuit and associated method

Examples

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Embodiment Construction

[0012]Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms “include” and “comprise” are used in an open-ended fashion, and thus should not be interpreted as a close-ended term such as “consist of”. Also, the term “couple” is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

[0013]FIG. 1 is a diagram illustrating total harmonic distortion and noise under the ternary mode and the quaternary mode in response to the output power of a class D amplifier. As shown in...

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Abstract

A quaternary / ternary modulation selecting circuit of an amplifier includes: a signal generating circuit, a detecting circuit, and a selecting circuit. The signal generating circuit is arranged to generate a ternary signal and a quaternary signal. The detecting circuit coupled to the signal generating circuit is arranged to generate a mode selecting signal according to at least the ternary signal. The selecting circuit coupled to the signal generating circuit and the detecting circuit is arranged to select and output one of the ternary signal and the quaternary signal to an output stage of the amplifier according to the mode selecting signal.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The present invention relates to an audio amplifier, and more particularly, to a quaternary / ternary modulation selecting circuit of an audio amplifier, and an associated method.2. Description of the Prior Art[0002]In audio applications, an analog amplifier is one of the most important parts in an audio system. Efficiency is a critical issue; a class D power amplifier is the most popular kind used in audio systems due to its higher efficiency compared to other kinds of amplifier. Because the output waveform of the class D power amplifier is a modulation signal between two voltage levels (i.e. supply voltage and ground) rather than a common linear waveform, ideally no current will pass through when the transistors of the output stage are non-conductive. Currently, a common modulation method applied in the class D power amplifier is Pulse Width Modulation (PWM), wherein quaternary modulation has the advantages of better total ha...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03F3/217H03F3/187H03F1/32H03F1/02
CPCH03F1/0205H03F1/32H03F3/187H03K19/20H03F3/217H03F2200/03H03F2200/351H03F2200/171H03F3/2171H03F2200/408H03F3/45475H03F2203/45594H03F2203/45512H03K5/24H03K21/026
Inventor TSAO, SZU-CHUNSHIH, DENG-YAO
Owner ELITE SEMICON MEMORY TECH INC
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