Accession Number:

ADD002907

Title:

Low Level Bio-Telemetry System Using C/MOS Multiplexing.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s):

• Vreeland,Robert

Report Date:

1976-06-08

Pagination or Media Count:

8.0

Abstract:

The patent relates to a low-power, transient-free, multi-channelled biotelemetry system which uses a series of CMOS switches coupled to the data sampling electrodes. Shift register pulses selectively enable the switches to sequentially shift the data sample inputs through nine, switch-controlled channels. The switches have little battery drain and, due to their N and P complimentary arrangement, their gating pulses are effectively cancelled and removed from the system channels. Multiplexing precedes amplification by applying switch outputs to a single, low-power amplifier. A special pulse position modulator employing a ramp generator circuit provides the pulse trains to a keyed transmitter. Other significant improvements including a unique shift register arrangement with a synchronizing interval permit long periods of continuous operation undisturbed by the need for battery changes. The transmitted data is received by a suitable demodulating receiver to produce a recordable output for evaluation and computer analysis.

Descriptors:

• *Telemeter systems
• *Biomedical information systems
• *Bioinstrumentation
• *Patents
• Complementary metal oxide semiconductors
• Multiplexing
• Electronic switching
• Electronic switches
• Low power

Subject Categories:

• Biomedical Instrumentation and Bioengineering
• Telemetry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE