A fully digital frequency shift keying demodulator chip for wireless biomedical implants

Author

Ghovanloo, Maysam ; Najafi, Khalil

Author_Institution

Centerfor Wireless Integrated Microsystems, Michigan Univ., Ann Arbor, MI, USA

fYear

2003

fDate

23-25 Feb. 2003

Firstpage

223

Lastpage

227

Abstract

A fully digital frequency shift keying (D-FSK) data transfer protocol and demodulator circuit has been developed with the data-rate to carrier-frequency ratio of up to 67%. Its primary application is in the magnetically coupled wireless systems such as biomedical implants and RFID-tags with high data rates above 1 Mbps. The demodulator circuit extracts the serial data bit stream and a constant-frequency clock from an FSK carrier signal in the 4∼20 MHz range, which can power the wireless system as well. The circuit occupies 0.29 mm² in the AMI 1.5 μm 2M/2P standard CMOS process and has a simulated data-rate of up to 2 Mbps and a measured rate of 200 Kbps while consuming less than 0.4 mW.

Keywords

CMOS logic circuits; biomedical communication; biomedical electronics; circuit simulation; demodulators; frequency shift keying; integrated circuit design; logic design; logic simulation; prosthetics; 0.4 mW; 1 Mbit/s; 1.5 micron; 2 Mbit/s; 200 Kbit/s; 4 to 20 MHz; CMOS; D-FSK data transfer protocol; FSK carrier signal range; RFID-tags; carrier signal powered wireless; constant-frequency clock; data-rate/carrier-frequency ratio; frequency shift keying demodulator; fully digital FSK demodulator; magnetically coupled wireless systems; serial data bit stream extraction; wireless biomedical implants; Ambient intelligence; CMOS process; Clocks; Coupling circuits; Data mining; Demodulation; Frequency shift keying; Implants; Measurement standards; Protocols;

fLanguage

English

Publisher

ieee

Conference_Titel

Mixed-Signal Design, 2003. Southwest Symposium on

Print_ISBN

0-7803-7778-8

Type

conf

DOI

10.1109/SSMSD.2003.1190431

Filename

1190431