Low-power circuit and method for providing rapid frequency lock

Details Low-power circuit and method for providing rapid frequency lock Low-power circuit and method for providing rapid frequency lock

1996-07-09

1998-06-16

Hofsass, Jeffrey

Communications: electrical

Continuously variable indicating

Plural transmitters

34028607, 34082572, 455375, 455119, 455343, 128903, G08C 1904, G08C 1910

Patent

active

057677913

ABSTRACT:
A two-way medical telemetry system is provided for displaying and monitoring, at a central location, physiologic and other patient data of multiple, remotely-located patients. The system comprises multiple battery-powered remote telemeters, each of which is worn by a respective patient, and a central station which receives, displays and monitors the patient data received (via RF) from the remote telemeters. The telemeters communicate with the central station using a two-way TDMA protocol which permits the time sharing of timeslots, and which uses a contention slot to permit telemeters to transmit service requests to the central station. Two-way spacial diversity is provided using only one antenna and one transceiver on each remote telemeter. The remote telemeters include circuitry for turning off the active transceiver components thereof when not in use (to conserve battery power), and include circuitry for performing a rapid, low-power frequency lock cycle upon power-up. The system has multiple modes of operation, including a frequency hopping (spread spectrum) mode and a fixed frequency mode, both of which preferably make use of the 902-928 MHz ISM band. Patient locators are provided to allow the clinician to track the location of each patient.

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