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- W2127519523 abstract "Over the last two decades, fixed coefficient FIR filters were generally optimized by minimizing the number of adders required to implement the multiplier block in the transposed direct form filter structure. In this paper, an optimization method for the structural adders in the transposed tapped delay line is proposed. Although additional registers are required, an optimal trade-off can be made such that the overall combinational logic is reduced. For a majority of taps, the delay through the structural adder is shortened except for the last tap. The one full adder delay increase for the last optimized tap is tolerable as it does not fall in the critical path in most cases. The criterion for which area reduction is possible is analytically derived and an area reduction of up to 4.5% for the structural adder block of three benchmark filters is estimated theoretically. The saving is more prominent as the number of taps grows. Actual synthesis results obtained by synopsys design compiler with 0.18 mum TSMC CMOS libraries show a total area reduction of up to 13.13% when combined with common subexpression elimination. In all examples, up to 11.96% of the total area saved were due to the reduction of structural adder costs by our proposed method." @default.
- W2127519523 created "2016-06-24" @default.
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- W2127519523 date "2009-05-01" @default.
- W2127519523 modified "2023-09-25" @default.
- W2127519523 title "Optimization of structural adders in fixed coefficient transposed direct form FIR filters" @default.
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- W2127519523 doi "https://doi.org/10.1109/iscas.2009.5118230" @default.
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