Title :
A Fully Digital ASK Demodulator With Digital Calibration for Bioimplantable Devices
Author :
Kafi Kangi, Mohammad ; Maymandi-Nejad, Mohammad ; Nasserian, Mahshid
Author_Institution :
Dept. of Electr. Eng., Ferdowsi Univ. of Mashhad, Mashhad, Iran
Abstract :
A new fully digital high-efficiency ASK demodulator for detecting data via inductive link is proposed. The proposed demodulator does not use any passive component and is compatible with standard CMOS digital technology. The modulation index, modulation rate, and power consumption of the proposed structure are <;4%, 100%, and 118.2 μW, respectively, at the carrier frequency of 13.56 MHz. Design issues of the demodulator are discussed in detail. A calibration technique is also proposed for the demodulator which compensates the impact of PVT variations as well as coil displacements in case it is used in an inductive link data and power transfer system. The designed circuit is implemented in the 0.18-μm CMOS technology.
Keywords :
CMOS digital integrated circuits; amplitude shift keying; biomedical electronics; calibration; coils; demodulators; inductive power transmission; integrated circuit design; prosthetics; radio links; telemedicine; PVT variation impact compensation; bioimplantable device; carrier frequency; circuit design; coil displacement impact compensation; data detection; demodulator design; digital calibration; frequency 13.56 MHz; fully digital ASK demodulator; high-efficiency ASK demodulator; inductive link data; modulation index; modulation rate; passive component; power 118.2 muW; power consumption; power transfer system; size 0.18 mum; standard CMOS digital technology compatibility; Amplitude shift keying; Calibration; Coils; Demodulation; Detectors; Integrated circuit modeling; ASK demodulator (ASKD); bioimplantable devices; data transmission; digital calibration; inductive link; pulse shrinking circuit;
Journal_Title :
Very Large Scale Integration (VLSI) Systems, IEEE Transactions on
DOI :
10.1109/TVLSI.2014.2343946
