DocumentCode :
745044
Title :
A 15-Electrode Totally Implanted Time-Multiplex Telemetry Unit
Author :
Deutsch, Sid
Author_Institution :
CMDNJ Rutgers Medical School and Elec. Engr. Dept.,Rutgers Univ.,Piscataway, NJ
Volume :
24
Issue :
10
fYear :
1976
fDate :
10/1/1976 12:00:00 AM
Firstpage :
1073
Lastpage :
1078
Abstract :
A 15-electrode totally implanted time-multiplex telemetry unit is described that is powered by two mercury cells in series. Transcutaneous radio frequency (RF) turn-on and magnetic turnoff are used to conserve battery power. The basic cycle rate is 400 Hz, channel rate 6400 Hz. The channel 16 input consists of a 200-Hz 5 mV peak-to-peak (p-p) reference signal, and a 3200-Hz sync signal is added to all channels. The unit is 
cm in size, weighs 41 g, and draws 3.5 mA. Low-frequency cutoff is at 0.2 Hz. The output is FM with a peak deviation of 75 kHz of a 20 MHz carrier at 5 mV peak channel input. The equivalent noise input is 2.8 μV root mean square (rms). The decoder automatically locks on the reference signal square wave with the aid of an exclusive-OR gate.
cm in size, weighs 41 g, and draws 3.5 mA. Low-frequency cutoff is at 0.2 Hz. The output is FM with a peak deviation of 75 kHz of a 20 MHz carrier at 5 mV peak channel input. The equivalent noise input is 2.8 μV root mean square (rms). The decoder automatically locks on the reference signal square wave with the aid of an exclusive-OR gate.Keywords :
Brain, EEG; Implantable radio transmitters; Time-division multiplexing; Animals; Batteries; Electrodes; Electroencephalography; Frequency modulation; Frequency synchronization; Implants; Radio frequency; Telemetry; Transmitters;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOM.1976.1093212
Filename :
1093212
Link To Document :
