156 dB low-voltage low-power CMOS exponential function generator circuit

作     者：Popa, Cosmin Radu 

作者机构：Univ Politehn Bucuresti Fac Elect Telecommun & Informat Technol Bucharest Romania 

出 版 物：《INTEGRATION-THE VLSI JOURNAL》 (Integr VLSI J)

年 卷 期：2025年第102卷

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：National University of Science and Technology Politehnica Bucharest  Romania 

主　　题：Exponential function generator Approximation function CMOS current mode Translinear loop Output dynamic range 

摘      要：An original exponential function generator is presented, the original approach allowing to extremely accurate approximate the exponential function. The circuit output dynamic range is approximately 156 dB, for a maximal approximation error equal with 1 dB. The new proposed method uses a very precise superior-order approximation function, which is developed for requiring a very ressonable hardware resources for its implementation in CMOS technology. For further improving the accuracy of the proposed function generator circuit, an additional new method using a convenient variable changing is used. The proposed computational structure is designed for low-voltage low-power operation. The circuit is supplied at 1.1 V and its maximal power consumption is approximately 5 mu W. The computational structure is developed for implementing in 0.18 mu TSMC CMOS process, the approximately area being 1600 mu m2. The SPICE simulations of the exponential function generator operation confirm the theoretical estimated results.