Spread-spectrum modulation circuit, variable frequency triangular-wave generator and signal processing method

A technology of spread spectrum modulation and triangular wave, which is applied in the field of communication, can solve the problem of high repetition frequency of signal spectrum components, achieve the effect of reducing electromagnetic interference and realizing simple structure

Active Publication Date: 2008-12-03
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using FFM (Fixed Frequency Mode, fixed frequency mode) triangular wave modulation, the energy of the signal on the spectrum is mainly concentrated on the frequency points of each harmonic component, and the repetition frequency of the signal spectrum component is high, which will cause serious EMI problems

Method used

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  • Spread-spectrum modulation circuit, variable frequency triangular-wave generator and signal processing method
  • Spread-spectrum modulation circuit, variable frequency triangular-wave generator and signal processing method
  • Spread-spectrum modulation circuit, variable frequency triangular-wave generator and signal processing method

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Embodiment Construction

[0032] An embodiment of the present invention also provides a spread spectrum modulation circuit, including a variable frequency triangular wave generator, a first comparator and a second comparator, the variable frequency triangular wave generator is connected to the first comparator and the second comparator respectively The two comparators are connected; the first comparator and the second comparator realize the spread spectrum of the pulse width modulation PWM according to the input signal and the variable frequency triangular wave signal input by the variable frequency triangular wave generator.

[0033] Wherein, the first comparator and the second comparator according to the input signal and the variable frequency triangular wave signal input by the variable frequency triangular wave generator, realizing the spread spectrum of the pulse width modulation PWM includes:

[0034] The first comparator and the second comparator respectively compare the input signal with the var...

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Abstract

The embodiment of the invention discloses a spread-spectrum modulation circuit, a variable frequency triangle generator and a signal processing method. The spread-spectrum modulation circuit comprises the variable frequency triangle generator, a first comparator and a second comparator; the variable frequency triangle generator is respectively connected with the first comparator and the second comparator; the first comparator and the second comparator realize the spread-spectrum of the pulse width modulation (PWM) according to the input signal and the variable frequency triangle waves input by the variable frequency triangle generator. In the embodiment of the invention, the random signal is used to control the changes of the so as to generate a triangle wave circuit with changed frequency, the spread-spectrum modulation circuit is realized, the structure realization is simple, and the high-frequency distribution is similar to the distribution of white noise, thus effectively reducing the electromagnetic interference in the existing circuit.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a spread spectrum modulation circuit, a variable frequency triangular wave generator and a signal processing method. Background technique [0002] Currently, Class D audio power amplifiers are widely used for power conversion of audio signals in driving loudspeakers. The class D power amplifier makes the output stage work in the switching state, so as to achieve the purpose of high efficiency. The class D power amplifier has the characteristics of high efficiency, which reduces or even eliminates the heat dissipation cost. It can greatly extend the battery life, reduce the system cost and reduce the volume when used in the handheld device. [0003] Since the PWM (Pulse Width Modulation, Pulse Width Modulation, Pulse Width Modulation, Pulse Width Modulation) modulated Filter less Class D power amplifier output still has high-frequency carrier and its harmonic components, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H03F3/217H03K7/08H03K4/502
CPCH04B2215/067H03K7/08H03K3/84H04B15/02
Inventor 谢旺生庞世甫
Owner HUAWEI TECH CO LTD
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