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D-type power amplifier

A power amplifier, amplifier technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve the problems of large chip size, total harmonic distortion, weakening total harmonic distortion, etc., to achieve chip size The effect of small, total harmonic distortion reduction and simple structure

Active Publication Date: 2013-02-13
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the prior art requires a triangular wave generator or a sawtooth wave generator to generate a carrier wave, resulting in a large chip size and easy generation of total harmonic distortion, and to provide an improved class D power amplifier. The class D power amplifier has a simple structure and does not require a triangle wave generator or a sawtooth wave generator, and at the same time weakens the total harmonic distortion caused by the nonlinearity of the carrier

Method used

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  • D-type power amplifier
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no. 1 Embodiment

[0023] As shown in FIG. 3 , it is a structure diagram of a class D power amplifier using hysteretic modulation in the present invention. The class D power amplifier includes an integrator 2 composed of a resistor R2, a capacitor C, and an operational amplifier U0. The resistor R2 and the capacitor C are connected in parallel between the output terminal and the inverting input terminal of the operational amplifier U0. Those skilled in the art should It is recognized that the integrator may take other forms.

[0024] The class D power amplifier also includes an amplifier input terminal 1, a square wave output circuit 3, a feedback loop 4, a gate control circuit 5, an output power circuit 6, and an amplifier output terminal 7, wherein the integrator 2 includes two input terminals and An output end, this output end is connected with the input end of described square wave output circuit 3; The output end of square wave output circuit 3 is connected with the input end of described g...

no. 2 Embodiment

[0049] FIG. 5 is a basic structural diagram of a class D operational amplifier according to a second specific embodiment of the present invention. In this structure, same as the first embodiment, there is an integrator composed of a resistor R2, a capacitor C, and an operational amplifier U0. The output terminal of the operational amplifier U0 is connected to the inverting input terminal of the comparator U1 and the non-inverting input terminal of the comparator U2. The difference from the first specific embodiment is that the non-inverting input terminal of the operational amplifier U0 is connected with a DC level value VR ef The DC reference signal 10, the inverting terminal receives the output signal SW fed back via the feedback loop 4, the feedback loop 4 in this embodiment includes the same resistor R1 as the first specific embodiment; at the same time, this embodiment uses a DC decoupling circuit U8 to The input signal removes the DC component, and then at the DC bias a...

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Abstract

The invention discloses a D-type power amplifier, relates to a power amplifier, and aims to solve the problems of larger chip size and easy total harmonic distortion brought by carrier wave generated by a triangle generator or a sawtooth generator in the prior art. The D-type power amplifier comprises an amplifier input end, an integrator, a square-wave output circuit, a feedback loop, a gate control circuit, an output power circuit and an amplifier output end, wherein the integrator comprises two input ends and one output end, and the output end is connected with an input end of the square-wave output circuit; an output end of the square-wave output circuit is connected with an input end of the gate control circuit; an output end of the gate control circuit is connected with an input end of the output power circuit; an output end of the output power circuit is connected with the amplifier output end; and the feedback loop is connected between the amplifier output end and one input end of the integrator.

Description

technical field [0001] The invention relates to a class D power amplifier, in particular to a class D power amplifier adopting hysteresis modulation. Background technique [0002] Class D power amplifiers are more efficient than linear amplifiers such as Class A / B amplifiers, since their output sections operate in switch mode, thus minimizing power consumption. The square wave generated by the output power circuit can be used to power a load such as a speaker. Usually, an additional filter is added between the output power circuit and the load speaker, and the filtered signal is the amplified input signal. [0003] The traditional class D amplifier shown in Fig. 1 includes a comparator CMP, which receives the triangular wave T generated from the triangular wave generator TG and the input signal S1. The comparator CMP generates a square wave S2 with a variable duty ratio by comparing the triangular wave signal T with the input signal S1. When the input is greater than the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217H03F1/34H03K4/02H03K19/173
Inventor 王锐
Owner CHENGDU MONOLITHIC POWER SYST