Title :
PLL-Based Contactless Energy Transfer Analog FSK Demodulator Using High-Efficiency Rectifier
Author :
Hwang, Yuh-Shyan ; Hwang, Bo-Han ; Lin, Ho-Cheng ; Chen, Jiann-Jong
Author_Institution :
Dept. of Electron. Eng., Nat. Taipei Univ. of Technol., Taipei, Taiwan
Abstract :
This paper proposes a new phase-locked-loop (PLL)-based inductive coupled contactless energy transfer (CET) analog frequency-shift keying (FSK) demodulator using a high-efficiency RF-to-dc rectifier for biomedical implanted devices. The analog FSK demodulator is composed of a modified CMOS three-stage rectifier, a voltage regulator, an FSK signal generator, and a PLL. The proposed modified single-stage rectifier with both positive and negative output voltages using a PMOS and an NMOS pass transistor, an inverter, and two capacitors has a small active area and can enhance the power conversion efficiency. The proposed RF-to-dc rectifier achieves an efficiency of 64% at 8.4 dBm. The power consumption of the demodulator is as low as 0.76 mW, and the active area is 0.084 mm2. The analog FSK demodulator supports a data rate of 100 kb/s to 1 Mb/s. The chip was implemented in a Taiwan Semiconductor Manufacturing Company (TSMC) 0.35- μm double-poly quadruple-metal CMOS technology to verify the proposed CET circuit. Two figures of merit are provided to illustrate the advantages of the proposed architecture.
Keywords :
CMOS integrated circuits; demodulators; frequency shift keying; inductive power transmission; phase locked loops; prosthetic power supplies; rectifying circuits; -efficiency RF-to-dc rectifier; CET circuit; FSK signal generator; NMOS pass transistor; PLL-Based contactless energy transfer analog FSK demodulator; PMOS pass transistor; TSMC double-poly quadruple-metal CMOS technology; Taiwan Semiconductor Manufacturing Company; analog frequency-shift keying demodulator; biomedical implanted devices; bit rate 100 kbit/s to 1 Mbit/s; capacitors; efficiency 64 percent; high-efficiency rectifier; inductive coupled contactless energy transfer; modified CMOS three-stage rectifier; modified single-stage rectifier; phase-locked-loop; power consumption; power conversion efficiency; size 0.35 mum; voltage regulator; Capacitors; Demodulation; Frequency shift keying; Inverters; Rectifiers; Transistors; Voltage control; Contactless energy transfer (CET); frequency-shift keying (FSK) demodulator; phase-locked loop (PLL); power conversion efficiency; rectifier;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2011.2181135