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A CORDIC-Based Architecture with Adjustable Precision and Flexible Scalability to Implement Sigmoid and Tanh Functions
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- Chen, Hui (author)
- Nanjing Univ, Sch Elect Sci & Engn, Nanjing, Peoples R China.
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- Jiang, Lin (author)
- Nanjing Univ, Sch Elect Sci & Engn, Nanjing, Peoples R China.
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- Luo, Yuanyong (author)
- Nanjing Univ, Sch Elect Sci & Engn, Nanjing, Peoples R China.
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- Nanjing Univ, Sch Elect Sci & Engn, Nanjing, Peoples R China Elektronik och inbyggda system (creator_code:org_t)
- IEEE, 2020
- 2020
- English.
- In: IEEE International Symposium on Circuits and Systems, ISCAS 2020. - : IEEE.
- Conference paper (peer-reviewed)
Abstract
Subject headings
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- In the artificial neural networks, tanh (hyperbolic tangent) and sigmoid functions are widely used as activation functions. Past methods to compute them may have shortcomings such as low precision or inflexible architecture that is difficult to expand, so we propose a CORDIC-based architecture to implement sigmoid and tanh functions, which has adjustable precision and flexible scalability. It just needs shift-add-or-subtract operations to compute high-accuracy results and is easy to expand the input range through scaling the negative iterations of CORDIC without changing the original architecture. We adopt the control variable method to explore the accuracy distribution through software simulation. A specific case (ARCH:(1, 15, 18), RMSE: 10(-6)) is designed and synthesized under the TSMC 40nm CMOS technology, the report shows that it has the area of 36512.78 mu m(2) and power of 12.35mW at the frequency of 1GHz. The maximum work frequency can reach 1.5GHz, which is better than the state-of-the-art methods.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Inbäddad systemteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Embedded Systems (hsv//eng)
Keyword
- CORDIC
- tanh
- sigmoid
- adjustable precision
- flexible scalability
Publication and Content Type
- ref (subject category)
- kon (subject category)
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- By the author/editor
- Chen, Hui
- Jiang, Lin
- Luo, Yuanyong
- Lu, Zhonghai
- Fu, Yuxiang
- Li, Li
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- Yu, Zongguang
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- About the subject
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- ENGINEERING AND TECHNOLOGY
- ENGINEERING AND ...
- and Electrical Engin ...
- and Embedded Systems
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- Royal Institute of Technology
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