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Class D amplifier circuit and electronic equipment comprising the same

A class-D amplifier and circuit technology, applied in amplifiers, low-frequency amplifiers, amplifier control, etc., can solve problems such as high power consumption and large ADC

Pending Publication Date: 2020-10-30
CIRRUS LOGIC INT SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such ADCs are relatively large (in terms of silicon area in an integrated circuit) and have relatively high power consumption in use

Method used

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  • Class D amplifier circuit and electronic equipment comprising the same
  • Class D amplifier circuit and electronic equipment comprising the same
  • Class D amplifier circuit and electronic equipment comprising the same

Examples

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Embodiment Construction

[0063] As previously mentioned, a class D amplifier for receiving an input signal and generating an output signal typically includes a modulator for controlling the class D output stage based on the modulator input signal. An error block may be provided which may eg include an ADC and a subtractor in the feedback path to generate an error signal based on the output signal and the input signal, eg the difference between a converted version of the output signal and the input signal. Embodiments of the present invention relate to class D amplifier circuits in which the extent to which the error signal contributes to the modulator input signal is variable based on an indication of the magnitude of the input signal. In some embodiments, the amplifier circuit can be selectively changed between at least two modes of operation based on the magnitude of the input signal. In the first mode of operation, the modulator input signal may be based at least in part on the error signal. In a ...

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Abstract

The present invention provides a Class D amplifier circuit for amplifying an input signal, the Class D amplifier circuit includes a controller configured to control the Class D amplifier circuit to selectively transition between an open loop mode of operation and a closed loop mode of operation based on an indication of an amplitude of the input signal.

Description

[0001] This application is a divisional application of an invention patent application with an application date of August 24, 2015, an application number of 201580058056.5, and a title of "Class D Amplifier Circuit". technical field [0002] The present invention relates to class D amplifier circuits, and more particularly to class D amplifiers that selectively vary the signal components used to drive the amplifier output stage based on the signal amplitude. Background technique [0003] figure 1 One embodiment of a conventional class D amplifier is illustrated. The modulator 101 controls the class D output stage 102 based on an input signal, which in this embodiment is a digital input signal Din, to generate an output signal Vout. The output stage 102 includes a plurality of switches for switching the output stage 102 between a plurality of voltages (eg, a supply voltage VDD and a ground voltage, or a positive supply voltage +VDD and a negative supply voltage −VDD). As wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217
CPCH03F1/26H03F1/32H03F3/187H03F3/217H03F3/2175H03F2200/102H03F1/34H03F2200/339H03G3/3089H03F3/2171H03F3/2173H03F2200/432H03G7/002H03G7/007
Inventor J·P·莱索T·井户
Owner CIRRUS LOGIC INT SEMICON