Audio modulation circuit and electronic equipment

An audio modulation and circuit technology, applied in electrical components, amplifiers, pulse shaping, etc., can solve the problem of high power consumption of audio amplifiers

Pending Publication Date: 2020-09-04
上海艾为集成电路技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the application provides an audio modulation circuit and an elect

Method used

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  • Audio modulation circuit and electronic equipment
  • Audio modulation circuit and electronic equipment
  • Audio modulation circuit and electronic equipment

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Embodiment Construction

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application. In the case of no conflict, the following embodiments and technical features thereof can be combined with each other.

[0043] Please refer to Figure 1a , is a schematic structural diagram of an audio modulation circuit according to an embodiment of the present invention.

[0044]In this embodiment, the audio modulation circuit is used to process a pair of differential signals, and the pair of differential signals are respectively coupled to the input terminals of the amplifier Amp1 for full differential a...

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Abstract

The invention discloses an audio modulation circuit and electronic equipment. The audio modulation circuit comprises an integral amplification module which comprises an integrator and a common-mode modulator, wherein the integrator is used for carrying out operational amplification on an input differential signal and outputting a first amplification signal and a second amplification signal, signallevel values of the first amplification signal and the second amplification signal are symmetrical about a common-mode reference voltage, and the common-mode modulator is used for outputting dynamically adjusted common-mode reference voltage to the integrator according to the first amplification signal and the second amplification signal; and a first comparator and a second comparator connected to two output ends of the integral amplification module respectively and used for comparing the first amplification signal and the second amplification signal with a modulation signal and outputting acorresponding first pulse width modulation signal and a corresponding second pulse width modulation signal. The power consumption of the audio modulation circuit is reduced.

Description

technical field [0001] The present application relates to the technical field of signal modulation, in particular to an audio modulation circuit and electronic equipment. Background technique [0002] A Class D audio amplifier is a commonly used high-efficiency amplifier for amplifying audio signals. In a system using a Class D amplifier, an analog input signal is converted into a series of pulse-modulated signals with different pulse widths to drive audio speakers. [0003] The existing class D audio amplifier usually has two output terminals, which are respectively connected to the positive and negative poles of the load, and the connection between the output terminal and the positive and negative poles of the load is usually connected to an LC filter structure or a switch control circuit. Whether it is static or dynamic working state, the output signal will cause a large power consumption in the LC filter structure or switch control circuit. [0004] As portable devices ...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03K5/04
CPCH03F1/0205H03K5/04
Inventor 薛蓉
Owner 上海艾为集成电路技术有限公司
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