CMOS Nth-Switchable-Root Circuit

Kuo-Jen LIN  Chih-Jen CHENG  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.1   pp.145-147
Publication Date: 2010/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.145
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
Keyword: 
Taylor series approximation,  nth-root circuit,  exponential circuit,  logarithm circuit,  

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Summary: 
A CMOS current-mode nth-switchable-root circuit composed of a compact logarithm circuit, a divide-by-n circuit, and a compact exponential circuit is proposed. The n can be selected from 5 values by three switches. Simulation results indicate that the compact nth-switchable-root circuit has a wide input-current range for relative errors less than 3%, low power dissipations below 630 µW, and high bandwidth over 330 MHz.