Novel chaotic frequency modulation circuit for class-D amplifier
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摘要: 针对D类音频放大器的电磁干扰问题,提出了应用于D类音频放大器的易于集成的混沌频率调制电路.电路中设计了新型的混沌序列生成器,并利用频闪映射方法建立了电路的混沌模型.新型电路在保留D类音频放大器结构的基础上,采用了全新的混沌频率三角波生成器,即以频率混沌变化的三角波替代了传统D类音频放大器中作为脉冲宽度调制载波的固定频率三角波.该电路已采用0.35μm CMOS工艺设计、验证和实现.仿真实验结果表明,使用混沌频率调制的D类音频放大器输出信号实现了15dB的电磁干扰峰值能量降幅.Abstract: The easy to be integrated chaotic frequency modulation circuit for class-D amplifier was proposed to solve electromagnetic interference(EMI) issue. In the circuit, an improved chaotic sequence generator was designed and its chaotic behavior was modeled by stroboscopic map. The proposed circuit only replaced fixed frequency ramp generator in conventional class-D amplifier architecture. Therefore, the spread spectrum triangular wave modulated by chaotic sequence was employed as carrier wave of pulse width modulation(PWM), instead of fixed frequency triangular wave. The circuit was designed, verified and implemented using 0.35μm CMOS process. Simulation results show that the peak power reduction can achieve to 15dB.
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Key words:
- chaos theory /
- interference suppression /
- power amplifiers
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