![]() The values obtained from the LUT sequentially.Ī table lookup is performed sequentially for each bit (in order of significance startingįrom the LSB). The LUT is followed by a shift and adder (scaling accumulator) that adds The LUT storesĪll possible sums of partial products over the filterĬoefficients space. W-bit address that indexes into a lookup table (LUT). The delay line is tapped (based on the input word size W), to form a This shift register serves as a delay line, storing the bit serial data samples. The serialized data is then fed to a bit-wise shift register. W is fed through a parallel to serial shift register, producing a In a DA realization of a FIR filter structure, a sequence of input data words of width Operations across shifters, lookup tables (LUTs) and adders in such a way that conventional The mainĪdvantage of DA is its high computational efficiency. Multiply-Accumulate Circuitry (MAC) for filters and other DSP applications. Designers frequently use DA to build efficient Distributed Arithmetic (DA) is a widely used technique for implementing sum-of-productsĬomputations without the use of multipliers. ![]()
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