请问:ADS1281 FIR滤波器 SESSION 1-4 每个阶段的Input sample rate,Decimation factor, Decimation offset, Estimated delay是如何确定的,在手册上没有发现相关的内容
感谢回答~
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您好,对于采样率或者sample rate和Decimation factor, 是根据您需要采样的带宽来决定的,当data rate决定了之后,通过DR[2:0] 和 DR[1:0] 的配置来配置decimation factor(ratio)。
对于 Estimated Delay (or group delay) ,您可以在线性相位(linear phase filter)或最小相位滤波(minimum phase filter)之间进行选择。 在这里、您要权衡输出受多快输入影响的速度与multi-tone 信号所包含的相位误差。