Title :
Switched-capacitor converter with low dropout voltage regulator for wireless sensor nodes
Author :
De Guzman, C.L.S. ; Nuestro, R.C. ; Roque, C.K. ; Alarcon, Louis P.
Author_Institution :
Microelectron. & Microprocessors Lab., Univ. of the Philippines - Diliman, Quezon City, Philippines
Abstract :
A 1V unregulated DC voltage from the rectifier of an energy harvesting node is converted down to 650mV regulated DC voltage with 10mV ripple (maximum frequency is 100MHz) by the switched-capacitor converter (SCC) that can supply up to 2.5mA current. For more supply sensitive loads such as RF blocks, a low dropout (LDO) voltage regulator steps down the SCC´s output to 500mV regulated DC voltage with at most 1.4% ripple. The LDO can supply a maximum load current of 1mA with 0.98% load regulation. Simulation results in 90nm CMOS show that the SCC has a maximum efficiency of 71% while the LDO has a maximum efficiency of 70.8% at maximum load current.
Keywords :
CMOS integrated circuits; energy harvesting; power convertors; rectifiers; switched capacitor networks; voltage regulators; CMOS; LDO voltage regulator; RF block; SCC; efficiency 70.8 percent; efficiency 71 percent; energy harvesting node; load regulation; low dropout voltage regulator; rectifier; ripple; size 90 nm; supply sensitive load; switched-capacitor converter; unregulated DC voltage; voltage 1 V; voltage 10 mV; voltage 650 mV; wireless sensor node; Capacitance; Capacitors; Logic gates; Regulators; Switches; Transistors; Voltage control; Low Dropout Regulator; Switched-Capacitor Converter; Voltage Regulator;
Conference_Titel :
TENCON 2012 - 2012 IEEE Region 10 Conference
Conference_Location :
Cebu
Print_ISBN :
978-1-4673-4823-2
Electronic_ISBN :
2159-3442
DOI :
10.1109/TENCON.2012.6412294
