Abstract
A 16-phase 8-branch charge pump with finger boost capacitor is proposed to increase the power efficiency. Compared with the standard capacitor, the finger capacitor can significantly reduce the parasitic capacitance. The proposed four-stage charge pump with finger capacitor can achieve 14.2 V output voltage from a 3 V power supply. The finger capacitor can increase the power efficiency of the charge pump to 60.5% and save chip area as well.
Highlights
In the last decade the wearable and portable electronic device market has shown an explosive increase
Compared with the inductor-based converter, a Dickson charge pump (CP) always experiences relatively low efficiency which is attributed to the parasitic capacitance (CP) of the flying boost capacitor (C)
As the energy stored in the battery is limited, it is necessary to design a CP with high efficiency and low power consumption in order to extend the electronic device’s battery autonomy
Summary
In the last decade the wearable and portable electronic device market has shown an explosive increase. Compared with the inductor-based converter, a Dickson CP always experiences relatively low efficiency which is attributed to the parasitic capacitance (CP) of the flying boost capacitor (C). One way to minimize the effect of parasitic capacitance is the charge recycling method This method can save 50 % of the power consumption attributed to the parasitic capacitance. In our previous work [2], a 16phase 8-branch CP is introduced which is based on the charge recycling concept but has an advanced charge recycling strategy This new CP has 7 intermediate voltage levels during the charge recycling process which can save 87 % of the power consumption related to the parasitic capacitance. Apart from the charge recycling method, another straightforward way to boost the power efficiency is by decreasing the parasitic capacitance of the boost capacitor itself. The finger capacitor is used in the 16-phase 8branch CP which can significantly increase the power efficiency compared with the CP using the standard capacitors
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