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Method for circuit fault detection in differential signal detectors

  • US 5,632,280 A
  • Filed: 07/25/1996
  • Issued: 05/27/1997
  • Est. Priority Date: 03/03/1995
  • Status: Expired due to Term
First Claim
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1. In an electrical circuit that detects differential mode signals in an environment where differential mode signals potentially co-exist with common mode signals wherein said circuit comprising,first and second input leads through which both common mode and differential mode signals are input from at least one signal source,a differential amplifier block having at least an output lead, an inverting node and a non-inverting node connected to said first and second input leads respectively, said amplifier block having a substantial differential gain of one and such that the signal from said output lead is input into said non-inverting node,a potential reference,a voltage source connected to said potential reference and to said inverting node of said amplifier block,an input lead resistor connected to one of said input leads and its corresponding amplifier block node,a method for continuous fault detection in said electrical circuit while detecting signals from a patient, the steps of said method comprising:

  • a) attaching the first and second input leads to the patient;

    b) inputting a known voltage signal from said voltage source into the inverting node of the amplifier block;

    c) monitoring the voltage signal on the output lead of the amplifier block; and

    d) determining if fault conditions exist in the circuit based on the voltage signal received at the output lead.

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