针对高阶Sigma-Delta调制器稳定性提升的相位补偿器设计
Information Recording Materials(2022)
Abstract
高阶Sigma-Delta调制器稳定性较差,增设相位补偿器并设计算法进行参数调整,提升系统稳定性.本文使用粒子群算法实现相位补偿器参数自整定,分别在分数阶和整数阶情况下求取系统最高信噪比,同时使用Lee判据判断系统的稳定性,通过MATLAB SIMULINK建模验证,四阶Sigma-Delta调制器在采样率OSR=256,增设分数阶相位补偿器信噪比提升了约8.4?dB,增设整数阶相位补偿器信噪比提升了约5.0dB.
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