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D type amplifier with second-order noise filtering circuit

A class D amplifier and noise filtering technology, which is applied to amplifiers with semiconductor devices/discharge tubes, amplifiers, improved amplifiers to reduce noise effects, etc., can solve problems such as limited open-loop gain, and achieve increased loop gain and fast Effects of attenuation and improvement of noise-distortion-to-noise ratio

Active Publication Date: 2013-05-01
EUTECH MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, the above-mentioned first-order feedback loop only synthesizes the sound signals by a single second differential amplifier for differential amplification, so the overall open-loop gain is quite limited

Method used

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  • D type amplifier with second-order noise filtering circuit
  • D type amplifier with second-order noise filtering circuit
  • D type amplifier with second-order noise filtering circuit

Examples

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Embodiment Construction

[0035] See figure 1 Shown is a circuit block diagram of a preferred embodiment of a class D amplifier 10 with a second-order noise filtering circuit of the present invention, which includes a gain adjustment circuit 11, a second-order integrator, two comparators 30, 31, and a logic The circuit 40 and an H-bridge switch circuit 50, wherein the H-bridge switch circuit 50 includes two half-bridge circuits 51, 52, and the control terminals of each half-bridge circuit 51, 52 are respectively connected to the output terminals of the logic circuit , And the series connection node of each half-bridge circuit 51, 52 is the differential output terminal (D0+, D0-) of the class D amplifier 10. The second-order integrator includes:

[0036] A first differential amplifier 20 includes a forward input terminal, a reverse input terminal, a reverse differential output terminal and a forward differential output terminal, wherein the forward input terminal is connected to the gain adjustment circui...

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PUM

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Abstract

The invention relates to a D type amplifier with a second-order noise filtering circuit. Two differential output ends form a two-order feedback loop respectively with a first differential amplifier and a second differential amplifier so as to provide a higher high frequency attenuation value, therefore, the noise and other nonlinear elements of the first differential amplifier and the second amplifier are fast attenuated to improve the overall distortion noise ratio; in addition, after respectively synthesized by the first differential amplifier and the second differential amplifier, the distortion components contained in output signals of the differential output ends are amplified in the way of second-order difference, thereby effectively improving over all loop gain and forming a high-gain system. And moreover, the differential output signals of the D type amplifier can be corrected more finely after being subjected to second-order gain processing.

Description

Technical field [0001] The present invention relates to a class D amplifier, in particular to a class D amplifier with a second-order noise filtering circuit. Background technique [0002] Generally speaking, the amplifier circuit of the output stage includes amplifiers of class A, class B, class AB, and class D. In the early stage, class AB amplifiers were more common. However, as the semiconductor process matures, D with lower power consumption Class amplifiers are becoming common. [0003] The biggest difference between a Class D amplifier and a Class AB amplifier is that the output pulse width modulation signal drives the inductive load, rather than a linear signal; the pulse width modulation signal includes sound signals, pulse width modulation switching signals and harmonics signal. Because the class D amplifier outputs the pulse width modulation signal, the switches of the output stage switching circuit switch from high impedance to very low impedance, and the conduction t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217H03F1/26
Inventor 赵尧主
Owner EUTECH MICROELECTRONICS
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