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D type amplifier with second-order noise filtering circuit

A class D amplifier, noise filtering technology, applied in amplifiers with semiconductor devices/discharge tubes, amplifiers, improving amplifiers to reduce noise effects, etc., can solve the problem of limited open-loop gain, etc. High frequency decay value, the effect of fast decay

Active Publication Date: 2010-12-29
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 the class D amplifier 10 with a second-order noise filtering circuit in the present invention, which includes a gain adjustment circuit 11, a second-order integrator, two comparators 30, 31, and a logic Circuit 40 and an H-type bridge switch circuit 50, wherein the H-type 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 nodes connected in series are the differential output terminals (D0+, D0−) of the class D amplifier 10 . Wherein 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 positive input terminal is connected to the gain adjustment circuit 11 to ...

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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 such as class A, class B, class AB, and class D. In the early days, class AB amplifiers were more common, but with the maturity of semiconductor manufacturing processes, D amplifiers with lower power consumption Class amplifiers are becoming more and more 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 instead of a linear signal; the pulse width modulation signal includes sound signals, pulse width modulation switching signals and harmonics Signal. Since the Class D amplifier outputs a pulse width modulation signal, each switch of the output stage switching circuit switches from high imped...

Claims

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Application Information

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IPC IPC(8): H03F3/217H03F1/26
Inventor 赵尧主
Owner EUTECH MICROELECTRONICS
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