An Analytical Model of Charge Pump DC-DC Voltage Multiplier Using Diodes

Toru TANZAWA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E100-A    No.5    pp.1137-1144
Publication Date: 2017/05/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E100.A.1137
Type of Manuscript: PAPER
Category: Circuit Theory
Keyword: 
charge pump,  extremely low-voltage,  integrated circuit design,  DC-DC power conversion,  multiplying circuits,  energy harvesting,  transducer,  

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Summary: 
An output voltage-current equation of charge pump DC-DC voltage multiplier using diodes is provided to cover wide clock frequency and output current ranges for designing energy harvester operating at a near-threshold voltage or in sub-threshold region. Equivalent circuits in slow and fast switching limits are extracted. The effective threshold voltage of the diode in slow switching limit is also derived as a function of electrical characteristics of the diodes, such as the saturation current and voltage slope parameter, and design parameters such as the number of stages, capacitance per stage, parasitic capacitance at the top plate of the main boosting capacitor, and the clock frequency. The model is verified compared with SPICE simulation.