Alternative data paths for the cascaded integrator-comb (CIC) decimator are presented that can be derived upon applying one or two modifications. In the first modification, the integrator-comb pair that surrounds the downsampling register is replaced by a simpler Integrate-and-Dump (ID) block that performs the same decimation task. The resulting data path is referred to as CIC-ID. In the second modification, the remaining comb filters are replaced by a timemultiplexed comb, and the resulting data path is referred to as CIC-ID-TMUX. Compared with a classic N-stage CIC, CIC-ID saves one arithmetic unit and one register, whereas CIC-ID-TMUX uses the same number of registers but trades (N - 1) arithmetic units for a simpler two-to-one multiplexer. Both CIC-ID and CIC-ID-TMUX perform slightly fewer arithmetic operations per output sample because of the absence of the comb filter absorbed by the ID block. Pruning formulas for both architectures are presented along with implementation details.

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级联的积分梳理抽取器的备用数据路径[提示和技巧]

给出了级联积分梳状（CIC）抽取器的替代数据路径，这些路径可在应用一或两个修改后得出。在第一修改中，包围下采样寄存器的积分梳对被执行相同抽取任务的更简单的积分转储（ID）块所代替。产生的数据路径称为CIC-ID。在第二修改中，剩余的梳状滤波器被时分复用的梳状结构代替，并且所得到的数据路径被称为CIC-ID-TMUX。与经典相比ñ阶段CIC，CIC-ID保存一个算术单元和一个寄存器，而CIC-ID-TMUX使用相同数量的寄存器但进行交易（ñ-1）用于简单的二对一多路复用器的算术单元。由于不存在ID块吸收的梳状滤波器，因此CIC-ID和CIC-ID-TMUX都对每个输出采样执行较少的算术运算。给出了两种体系结构的修剪公式以及实现细节。