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Efficient D-type amplifier with reduced EMI generation

A comparator and square wave technology, applied to amplifiers, amplifiers, low-frequency amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as increasing EMI

Active Publication Date: 2016-12-07
STMICROELECTRONICS (SHENZHEN) R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, switching of active devices results in increased EMI, which is particularly undesirable in smartphones and tablets

Method used

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  • Efficient D-type amplifier with reduced EMI generation
  • Efficient D-type amplifier with reduced EMI generation
  • Efficient D-type amplifier with reduced EMI generation

Examples

Experimental program
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Embodiment Construction

[0014] One or more embodiments will be described below. These described embodiments are merely examples of implementation techniques as defined solely by the appended claims. Additionally, in order to provide a focused description, unrelated features of an actual implementation may not be described in the specification.

[0015] refer to figure 1 , class D amplifier 100 with bridged load 160 is now described. The structure of the class D amplifier 100 will be described first, and the operation thereof will be described later.

[0016] Class D amplifier 100 includes a first analog audio input channel 110a and a second analog audio input channel 110b. Both the first and second analog audio input channels 110a, 110b include the same fully differential amplifier 112 . The fully differential amplifier 112 includes an input resistor Rin and a feedback resistor R1, which sets the gain. The output of the fully differential amplifier 112 is fed back to another fully differential a...

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PUM

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Abstract

A D-type amplifier comprises a signal processing module. The signal processing module is used for generating a first processed signal for representing the difference between a first differential signal and a second differential when a duty ratio of the first differential signal is greater than that of the second differential signal, and generating the first processed signal for representing the reference DC level when the duty ratio of the first differential signal is less than that of the second differential signal, generating a second processed signal for representing the difference between the second differential signal and the first differential signal when the duty ratio of the second differential signal is greater than that of the first differential signal, and generating the second processed signal for representing the reference DC level when the duty ratio of the second differential signal is less than that of the first differential signal.

Description

technical field [0001] The present disclosure relates to the technical field of class-D audio amplifiers, and more particularly to a class-D amplifier design with reduced EMI compared to conventional class-D amplifiers. Background technique [0002] Portable electronic devices such as smartphones and tablets are popular with customers. These portable electronic devices are capable of playing back audio and therefore employ audio amplifiers. Because these portable electronic devices are powered by batteries, reducing power consumption is a commercial need, and Class D audio amplifiers, which are more efficient than Class AB audio amplifiers, could potentially be suitable for use in these electronic devices. [0003] A class D amplifier is an electronic amplifier in which the amplifying device (usually a MOSFET) operates as an electronic switch rather than a linear gain device as in other amplifiers. The analog signal to be amplified is converted into a sequence of square pu...

Claims

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Application Information

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IPC IPC(8): H03F3/217
CPCH03F3/183H03F3/2173H03F3/45475H03F2200/03H03F2203/45138H03F3/217H03F3/2171
Inventor 刘启宇林鸿武
Owner STMICROELECTRONICS (SHENZHEN) R&D CO LTD