Common mode signal detection
Abstract
Abstract COMMON MODE SIGNAL DETECTION IS PROVIDED IN AN ELECTRONIC SYSTEM HAVING A DIFFERENTIAL INPUT AMPLIFIER CONSISTING OF TWO ACTIVE ELEMENTS CONNECTED TO A COMMON CONSTANT CURRENT SOURCE BY DETECTING A VOLTAGE PRODUCED ACROSS THE CONSTANT CURRENT SOURCE IN RESPONSE TO A COMMON MODE SIGNAL SUPERIMPOSED ON THE DIFFERENTIAL INPUT SIGNAL. A THRESHOLD DEVICE IS THEN EMPLOYED TO DETERMINE WHEN THE COMMON MODE SIGNAL EXCEEDS A PREDETERMINED VOLTAGE LEVEL. THE DIFFERENTIAL AMPLIFIER SHOULD HAVE A COMMON MODE REJECTION FACTOR INSUFFICIENT TO REDUCE UNWANTED DIFFERENTIAL OUTPUT SIGNALS (AS AN EQUIVALENT DIF- FERENTIAL INPUT NOISE) TO AN AMPLITUDE NOT GREATER IN ORDER OF MAGNITUDE THAN THE INPUT SIGNAL. AN ALARM SYSTEM IS CONNECTED TO THE THRESHOLD DEVICE TO SIGNAL WHEN THE COMMON MODE SIGNAL EXCEEDS THE PREDETERMINED VOLTAGE LEVEL. THIS COMMON MODE SIGNAL DETECTION SYSTEM MAY BE EMPLOYED TO PARTICULAR ADVANTAGE IN ELECTRONIC SYSTEMS FOR MONITORING BIOPOTENTIALS SINCE IT PROVIDES A CONVENIENT WAY OF DETERMINING WHEN A BIOPOTENTIAL ELECTRODE HAS BECOME DETACHED FROM THE SUBJECT.
Inventors
- 👤 Fredrick J Savaglio
- 👤 Thomas C Woods
- 👤 Allan F Pacela
Bibliographic Details
Claims Analysis
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