A high-rate frequency shift keying demodulator chip for wireless biomedical implants

Author

Ghovanloo, Maysam ; Najafi, Khalil

Author_Institution

Center for Wireless Integrated Microsystems, Michigan Univ., Ann Arbor, MI, USA

Volume

5

fYear

2003

Abstract

A high-rate frequency shift keying (FSK) data transfer protocol and demodulator circuit has been developed with a data-rate to carrier-frequency ratio up to 67%. Its primary application is in the wireless biomedical implants in need of data transfer 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 2∼20 MHz range, which is used to power the implant through inductive coupling. The chip occupies 0.41 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 0.5 mW.

Keywords

biomedical communication; biomedical electronics; demodulators; frequency shift keying; prosthetics; 1.5 micron; 2 Mbit/s; 2 to 20 MHz; 200 Kbit/s; constant-frequency clock; data rate to carrier-frequency ratio; frequency shift keying demodulator chip; inductive coupling; serial data bit stream; simulated data-rate; 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

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on

Print_ISBN

0-7803-7761-3

Type

conf

DOI

10.1109/ISCAS.2003.1206170

Filename

1206170