TY - JOUR
T1 - A low noise, high power efficiency supply regulator for near-field power delivery
AU - Harrington, Peter
AU - Chakraborty, Sudipto
AU - Bakkaloglu, Bertan
N1 - Funding Information:
Acknowledgment This research is supported by National Science Foundation, Award number 0735268.
PY - 2011/2
Y1 - 2011/2
N2 - In order to deliver near-field electromagnetic power to a biomedical device or an RFID tag efficiently, the downlink signal is preferred to be at a high voltage level. To reduce power consumption and meet low supply requirements, it is advantageous for the remote device power supply to step-down the input voltage following rectification, typically using switch-mode regulators. The output ripple of a switched capacitor converter is inversely proportional to the filtering capacitance at the output node and switching frequency. In this paper, a hybrid DC-DC converter utilizing a switched capacitor regulator in master-slave configuration with a linear regulator is presented. Linear regulator actively cancels the switching ripple, while low frequency and DC current is provided by the switched capacitor converter. The converter is designed to receive an average input voltage of 5 Vpk from the receiver coil, with an output voltage of 2 V, and 5 mA of output current. The proposed regulator is fabricated in 0.35 μm technology. The power efficiency is measured to be 67%, with a nominal peak to peak ripple of less than 2 mV at the output.
AB - In order to deliver near-field electromagnetic power to a biomedical device or an RFID tag efficiently, the downlink signal is preferred to be at a high voltage level. To reduce power consumption and meet low supply requirements, it is advantageous for the remote device power supply to step-down the input voltage following rectification, typically using switch-mode regulators. The output ripple of a switched capacitor converter is inversely proportional to the filtering capacitance at the output node and switching frequency. In this paper, a hybrid DC-DC converter utilizing a switched capacitor regulator in master-slave configuration with a linear regulator is presented. Linear regulator actively cancels the switching ripple, while low frequency and DC current is provided by the switched capacitor converter. The converter is designed to receive an average input voltage of 5 Vpk from the receiver coil, with an output voltage of 2 V, and 5 mA of output current. The proposed regulator is fabricated in 0.35 μm technology. The power efficiency is measured to be 67%, with a nominal peak to peak ripple of less than 2 mV at the output.
KW - Linear regulators
KW - Power transmission efficiency
KW - RF link
KW - Switched capacitor DC-DC step-down converter
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U2 - 10.1007/s10470-010-9511-7
DO - 10.1007/s10470-010-9511-7
M3 - Article
AN - SCOPUS:79951580502
SN - 0925-1030
VL - 66
SP - 177
EP - 187
JO - Analog Integrated Circuits and Signal Processing
JF - Analog Integrated Circuits and Signal Processing
IS - 2
ER -