Utilize the Shift-and-Add Architecture to Approximate Multiple Nonlinear functions
Utilize the Shift-and-Add Architecture to Approximate Multiple Nonlinear functions
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利用移位加法架构来逼近多个非线性函数
DOI：
10.1002/cta.2994
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Yuchun Chang
中科院分区：
文献类型：
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作者：
Botao Xiong;Yuanfeng Sui;Zhi Jia;Sicun Li;Yuchun Chang
分段线性近似方法用于估计非线性函数，该方法通过由三个模块组成的移位和加法架构来实现：“加法器树”，“多路复用器”和“段索引编码器”。与现有技术相比，本文提出的设计流程使得“加法器树”和“多路复用器”模块可以被多个非线性函数共享。换句话说，移位相加架构可以近似多个非线性函数，而开销很小。融合对数和反对数转换器证明了所提出的方法的可行性。对数转换器以14%的单元面积和6%的延迟为代价实现了反对数函数。
The piecewise linear approximation method is used to estimate the non‐linear functions, which is implemented by the shift‐and‐add architecture consisting of three blocks: “adder tree,” “multiplexer,” and “segment index encoder.” Compared with state of the art, the design flow in this letter enables the “adder tree” and “multiplexer” blocks can be shared by multiple nonlinear functions. In other words, the shift‐and‐add architecture can approximate multiple nonlinear functions with a slight overhead. The fused Log and Antilog converter demonstrates the feasibility of the proposed method. The Antilog function is implemented by the Log converter at the cost of 14% cell area and 6% delay.