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本文在理论上分析了△调制中斜率过载信号的边沿抖动,导出了平均边沿抖动噪声能量公式,并给出降低边沿抖动的方法。实验结果表明:预先将输入信号的斜率限制为△调制器斜率跟踪能力δf_s的80～90％时,斜率过载信号的边沿抖动可以降低10dB以上。
In this paper, the edge jitter of slope overload signal in △ modulation is analyzed theoretically, and the energy formula of average jitter noise is deduced. The method of reducing the edge jitter is also given. The experimental results show that the edge jitter of the slope overload signal can be reduced by more than 10dB when the slope of the input signal is limited to 80 ~ 90% of the delta modulator slope tracking ability δf_s beforehand.