TY - GEN
T1 - A 0.15V-input energy-harvesting charge pump with switching body biasing and adaptive dead-time for efficiency improvement
AU - Kim, Jungmoon
AU - Mok, Philip K.T.
AU - Kim, Chulwoo
PY - 2014
Y1 - 2014
N2 - Design of low-voltage and efficient energy-harvesting circuits is becoming increasingly important, particularly, for autonomous systems. Since the amount of energy that can be harvested from the surrounding environment is limited, the available output voltage of a harvester is low. Therefore, the design of a low-input-voltage (low-VIN) up-converter is critical to self-powered systems [1-3]. Moreover, the form factor is very constrained in applications such as wearable electronic devices and sensor networks. Recently, low-V IN charge pumps (CPs) for energy harvesting has been compared with DC-DC converters using a large inductor [1-3]. CPs introduced in [1] and [2] use the advanced process technology to push VIN down to the subthreshold region. The CP in [1] introduces a forward-body-biasing (FBB) technique, which improves the voltage conversion efficiency (VCE) for low VIN but shows poor power conversion efficiency (PCE). The CP in [2] achieves the lowest operation voltage. However, the design with a 10-stage CP provides low output power. This paper presents a CP with switching-body-biasing (SBB), adaptive-dead-time (AD), and switch-conductance (SW-G) enhancement techniques to improve the PCE for low VIN as well as to extend the maximum load current.
AB - Design of low-voltage and efficient energy-harvesting circuits is becoming increasingly important, particularly, for autonomous systems. Since the amount of energy that can be harvested from the surrounding environment is limited, the available output voltage of a harvester is low. Therefore, the design of a low-input-voltage (low-VIN) up-converter is critical to self-powered systems [1-3]. Moreover, the form factor is very constrained in applications such as wearable electronic devices and sensor networks. Recently, low-V IN charge pumps (CPs) for energy harvesting has been compared with DC-DC converters using a large inductor [1-3]. CPs introduced in [1] and [2] use the advanced process technology to push VIN down to the subthreshold region. The CP in [1] introduces a forward-body-biasing (FBB) technique, which improves the voltage conversion efficiency (VCE) for low VIN but shows poor power conversion efficiency (PCE). The CP in [2] achieves the lowest operation voltage. However, the design with a 10-stage CP provides low output power. This paper presents a CP with switching-body-biasing (SBB), adaptive-dead-time (AD), and switch-conductance (SW-G) enhancement techniques to improve the PCE for low VIN as well as to extend the maximum load current.
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U2 - 10.1109/ISSCC.2014.6757484
DO - 10.1109/ISSCC.2014.6757484
M3 - Conference contribution
AN - SCOPUS:84898081440
SN - 9781479909186
T3 - Digest of Technical Papers - IEEE International Solid-State Circuits Conference
SP - 394
EP - 395
BT - 2014 IEEE International Solid-State Circuits Conference, ISSCC 2014 - Digest of Technical Papers
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2014 61st IEEE International Solid-State Circuits Conference, ISSCC 2014
Y2 - 9 February 2014 through 13 February 2014
ER -