Design of a Booster Charge Pump for Microenergy Collection
Switched capacitor direct current (DC-DC) converters are an extremely important part of power management systems,and boost charge pumps are a branch of them. In the application scenario of micro energy collection,the research hotspot of boost charge pumps is to achieve low leakage current and low threshold voltage loss. Most boost charge pumps are designed to reduce non ideal effects such as threshold voltage loss and charge sharing,resulting in increased leakage current or complex structure,leading to increased area and are not suitable for micro energy collection scenarios. Dickson charge pump is an early charge pump structure that is simple and practical,but its biggest drawback is the large threshold voltage loss. Therefore,this article is based on the analysis of Dickson charge pump,using TSMC 250 nm process and replacing diodes with Medium Threshold Voltage ( MVT) type Metal Oxide Semiconductor Field Effect Transistor ( MOS) to reduce threshold voltage loss,and then using bulk source diode bias technology to further reduce threshold voltage loss. This article uses the cascading form of Positive MOS ( PMOS) transistor and Negative MOS ( NMOS) transistor to reduce leakage current,and NMOS transistor adopts deep N-well technology to avoid adding auxiliary circuits. The simulation results show that the structure design of the boost charge pump in this paper has good performance and meets the design requirements.
microenergy collectionbooster charge pumplow leakage currentlow threshold voltage loss
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