Truncation error compensation circuit of FIR filter

摘要

The present invention relates to a truncation error compensation circuit of an FIR filter, and more particularly, to a truncation error compensation circuit of an FIR filter, ⁿAnd a circuit that compensates for truncation errors caused by integer filter coefficients, The truncation error compensation circuit of the FIR filter according to the present invention includes a plurality of first to N-th flip-flops connected in series by inputting an input signal: the first to N-th flip-Respectively. ⁿFirst to (N + l) th shifters shifted by the filter coefficient of the first shifter and the second shifter: a first adder for introducing and adding the output signals of the first and second shifters and the first compensator bits; And a multiplexer for receiving and adding the output signal of the (M + 1) th shifter and the M + 1 compensation bits of the (M + 1) th shifter and a multiplexer for outputting the 0 th And the like. Accordingly. If the filter integer count value of the shifter is 2^-nTo compensate for the truncation error by adding a compensation bit having a value of 1 to the shifter output value truncated to a value less than the decimal point.