Earphone amplifier with switch-off function and without output capacitor

A headphone amplifier with no output technology, applied in earpiece/headphone accessories, headphone mechanical/electronic switches, loudspeakers, etc., can solve the problems of increasing the power consumption of wireless headphones, shortening the use time of wireless headphones, and affecting people's use experience. Achieve the effect of saving board space and cost, improving dynamic range, and eliminating transient noise

Pending Publication Date: 2017-07-04
无锡钠瓦特电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, traditional earphones basically have no shutdown control, which will greatly increase the power consumption of wireless earphones in wireless applications, shorten the use time of wireless earphones, and affect people's experience.

Method used

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  • Earphone amplifier with switch-off function and without output capacitor
  • Earphone amplifier with switch-off function and without output capacitor

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Embodiment Construction

[0023] Specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0024] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0025] Such as figure 1 As shown, a headphone amplifier with a shutdown function without an output capacitor includes: a bandgap reference circuit 14, an oscillator circuit 11, a charge pump circuit 12, a headphone operational amplifier 13, a shutdown control circuit 17, an internal protection circuit 15, Click suppression circuit 16; described bandgap reference circuit 14 is used to provide reference voltage for described oscillator circuit 11, provides reference bias curren...

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Abstract

The invention discloses an earphone amplifier with a switch-off function and without output capacitor. A bandgap reference circuit is used for supplying a reference voltage to an oscillator circuit and supplying a reference bias current to an earphone operational amplifier. The oscillator circuit is used for supplying a switching frequency to a charge pump circuit. The charge pump circuit is used for supplying a negative voltage source to the earphone operational amplifier. The earphone operational amplifier is used for enabling output bias of an earphone to be lowest. A switch-off control circuit is used for switching off a charge pump, thereby enabling a whole circuit to be in low power consumption. According to the earphone amplifier, the negative voltage source is generated through adoption of the charge pump circuit, so the output bias of the earphone is enabled to be lowest. Compared with a traditional single-power earphone driver, the earphone amplifier has the advantages that an output dynamic range is almost doubled, a big size direct current blocking capacitor is unnecessary, a circuit board space is reduced, and the cost is reduced.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of earphone amplifiers, in particular to an earphone amplifier with a shutdown function and no output capacitor. [0003] Background technique: [0004] With the rise of smart portable devices, such as smartphones and tablet computers have become indispensable electronic devices in people's daily life. With the popularization and application of TYPE-C interfaces, the headphone jacks in smart The wirelessization of mobile phones is bound to become popular on a large scale. [0005] At present, wired earphones are used in portable devices on the market. Traditional wired earphones are driven by a single power supply. The output needs to be biased at a DC reference voltage, and then the earphones are driven by a large-capacity DC blocking capacitor. Moreover, traditional earphones basically have no power-off control, which will greatly increase the power consumption of wireless earphones in wireless app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/10
CPCH04R1/1041H04R2201/10
Inventor 刘明洋陈龙
Owner 无锡钠瓦特电子有限公司
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