Title :
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
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;
Conference_Titel :
Mixed-Signal Design, 2003. Southwest Symposium on
Print_ISBN :
0-7803-7778-8
DOI :
10.1109/SSMSD.2003.1190431
