No decimation fir filter

The present invention relates to a discrete signal FIR filter. As more specifically to improve the attenuation characteristic of the FIR filter is configured as a switched capacitor, to a filter structure to remove the down-sampled by the decimation function to be used to connect the FIR filter in the cascade structure. FIR filter in accordance with an aspect of the present invention, the plurality of sub-blocks having one of the following states: a reset state for a transfer state, or operating the initialization for outputting the N-charging state, the stored samples for storing the input samples It included, and there is such a state that each variable by the external clock signal, a plurality of sub-blocks of the at least any one sub-block is always characterized in that in the transfer state. FIR, Decimation, charging status, transfer status, reset state, cascaded