数字加法器需要更多的电路、因而需要更大的功率才能工作，但它不需要这么高的准确性。
A digital adder needs more circuitry, and thus more power, to operate, but it does not require such high accuracy.
高速数字串行加法器及其应用。
利用帧存储器作延迟线，结合数字带通滤波器、加法器和数学平衡器等组成数字梳状滤波器，形成所需要的滤波特性。
We also made the COF using frame memories and digital BPF and adders and digital balancer. The COF filter's feature is required.
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