CAJ | 학술논문

设计了一种用于D类音频功放的新型扩频振荡器。采用电流控制模式，利用伪随机数字频率调制，使谐波能量更加分散，频谱幅度更小，从而减小D类音频功放的EMI辐射。基于UMC0．6μm30VBCD工艺，对提出的扩频振荡器电路进行仿真验证。结果显示，扩频频率点具有良好的均匀性和随机性，并且D类音频功放的EMI主峰值幅度下降了4dB，其余EMI的峰值幅度下降了大约10dB，扩频降低电磁干扰（EMI）辐射的效果显著。
설계료일충용우D류음빈공방적신형확빈진탕기。채용전류공제모식，이용위수궤수자빈솔조제，사해파능량경가분산，빈보폭도경소，종이감소D류음빈공방적EMI복사。기우UMC0．6μm30VBCD공예，대제출적확빈진탕기전로진행방진험증。결과현시，확빈빈솔점구유량호적균균성화수궤성，병차D류음빈공방적EMI주봉치폭도하강료4dB，기여EMI적봉치폭도하강료대약10dB，확빈강저전자간우（EMI）복사적효과현저。
A new type of spread spectrum oscillator for the Class D audio amplifier was proposed. By adopting Current-control mode, and using pseudo-random digital frequency modulation, the harmonic energy was more dispersed, the spectrum magnitude was smaller, which reduced EMI emissions of class D audio amplifier. Based on UMC 0.6 um 30V BCD process, the proposed spread spectrum oscillator circuit was simulated. Simulation results showed that spread spectrum frequency points of the circuit had good uniformity and randomness, and the peak amplitude of the measured out-of-band noise was 4 dB lower than that in fixed frequency Class D audio amplifier, the peak rate of the rest of EMI declined by about 10 dB, and the effect of spreading to reduce electromagnetic interference （ EMI ） emission is remarkable.