A variable output voltage switched-capacitor DC-DC converter with pulse density andwidth modulation (PDWM) for 57% ripple reduction at low output voltage

Xin Zhang; Yu Pu; Koichi Ishida; Yoshikatsu Ryu; Yasuyuki Okuma; Po-Hung Chen; Takayasu Sakurai; Makoto Takamiya

doi:10.1587/transele.E94.C.953

A variable output voltage switched-capacitor DC-DC converter with pulse density andwidth modulation (PDWM) for 57% ripple reduction at low output voltage

Xin Zhang^*, Yu Pu, Koichi Ishida, Yoshikatsu Ryu, Yasuyuki Okuma, Po-Hung Chen, Takayasu Sakurai, Makoto Takamiya

^*Corresponding author for this work

Institute of Electronics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

In this paper, a novel switched-capacitor DC-DC converter with pulse density and width modulation (PDWM) is proposed with reduced output ripple at variable output voltages. While performing pulse density modulation (PDM), the proposed PDWM modulates the pulse width at the same time to reduce the output ripple with high power efficiency. The prototype chip was implemented using 65 nm CMOS process. The switched-capacitor DC-DC converter has 0.2-V to 0.47-V output voltage and delivers 0.25-mA to 10-mA output current from a 1-V input supply with a peak efficiency of 87%. Compared with the conventional PDM scheme, the proposed switched-capacitor DC-DC converter with PDWM reduces the output ripple by 57% in the low output voltage region with the efficiency penalty of 2%.

Original language	English
Pages (from-to)	953-959
Number of pages	7
Journal	IEICE Transactions on Electronics
Volume	E94-C
Issue number	6
DOIs	https://doi.org/10.1587/transele.E94.C.953
State	Published - Jun 2011

Keywords

DC-DC converter
Low ripple
Low voltage
Pulse density modulation
Pulse width modulation
Switched-capacitor

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10.1587/transele.E94.C.953

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title = "A variable output voltage switched-capacitor DC-DC converter with pulse density andwidth modulation (PDWM) for 57% ripple reduction at low output voltage",

abstract = "In this paper, a novel switched-capacitor DC-DC converter with pulse density and width modulation (PDWM) is proposed with reduced output ripple at variable output voltages. While performing pulse density modulation (PDM), the proposed PDWM modulates the pulse width at the same time to reduce the output ripple with high power efficiency. The prototype chip was implemented using 65 nm CMOS process. The switched-capacitor DC-DC converter has 0.2-V to 0.47-V output voltage and delivers 0.25-mA to 10-mA output current from a 1-V input supply with a peak efficiency of 87%. Compared with the conventional PDM scheme, the proposed switched-capacitor DC-DC converter with PDWM reduces the output ripple by 57% in the low output voltage region with the efficiency penalty of 2%.",

keywords = "DC-DC converter, Low ripple, Low voltage, Pulse density modulation, Pulse width modulation, Switched-capacitor",

author = "Xin Zhang and Yu Pu and Koichi Ishida and Yoshikatsu Ryu and Yasuyuki Okuma and Po-Hung Chen and Takayasu Sakurai and Makoto Takamiya",

year = "2011",

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doi = "10.1587/transele.E94.C.953",

language = "English",

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AU - Zhang, Xin

AU - Pu, Yu

AU - Ishida, Koichi

AU - Ryu, Yoshikatsu

AU - Okuma, Yasuyuki

AU - Chen, Po-Hung

AU - Sakurai, Takayasu

AU - Takamiya, Makoto

PY - 2011/6

Y1 - 2011/6

N2 - In this paper, a novel switched-capacitor DC-DC converter with pulse density and width modulation (PDWM) is proposed with reduced output ripple at variable output voltages. While performing pulse density modulation (PDM), the proposed PDWM modulates the pulse width at the same time to reduce the output ripple with high power efficiency. The prototype chip was implemented using 65 nm CMOS process. The switched-capacitor DC-DC converter has 0.2-V to 0.47-V output voltage and delivers 0.25-mA to 10-mA output current from a 1-V input supply with a peak efficiency of 87%. Compared with the conventional PDM scheme, the proposed switched-capacitor DC-DC converter with PDWM reduces the output ripple by 57% in the low output voltage region with the efficiency penalty of 2%.

AB - In this paper, a novel switched-capacitor DC-DC converter with pulse density and width modulation (PDWM) is proposed with reduced output ripple at variable output voltages. While performing pulse density modulation (PDM), the proposed PDWM modulates the pulse width at the same time to reduce the output ripple with high power efficiency. The prototype chip was implemented using 65 nm CMOS process. The switched-capacitor DC-DC converter has 0.2-V to 0.47-V output voltage and delivers 0.25-mA to 10-mA output current from a 1-V input supply with a peak efficiency of 87%. Compared with the conventional PDM scheme, the proposed switched-capacitor DC-DC converter with PDWM reduces the output ripple by 57% in the low output voltage region with the efficiency penalty of 2%.

KW - DC-DC converter

KW - Low ripple

KW - Low voltage

KW - Pulse density modulation

KW - Pulse width modulation

KW - Switched-capacitor

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A variable output voltage switched-capacitor DC-DC converter with pulse density andwidth modulation (PDWM) for 57% ripple reduction at low output voltage

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Keywords

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