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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: IEEE Trans Circuits Syst II Express Briefs. 2013 Oct;60(10):707–711. doi: 10.1109/TCSII.2013.2278104

TABLE I.

Capacitor Charging System Specifications

Overall System Capacitor Charger
Process 0.35 μm CMOS # of channel 4
L2/C2/CS 1.2μH / 4nF / 1nF Target voltage ±1 ~ ±2 V
Carrier freq. 2 MHz Charging off. 63 ~ 82%
Coil distance 1.5 cm Charging time 132 ~ 420 μs
Vcoil peak 2.7 V CP/CN 1 μF / 1 μF
Area 2.1 mm2 PSupply(Charging) 240 μW
Rectifier / Regulator Adaptive Capacitor Tuner
VRECP / VRECN 2.25 V / -2.25 V Tuning bit 7-bit
VDD / VSS 2.1 V / -2.1 V Adaptive cap. 0 ~ 1024 pF
Rec. PCE 72% w/50 kΩ PStatic 20 μW*
*

Simulation