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 $1.5 \\times 2.5 \\times 8$ 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