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Physiological signal amplifier with voltage protection and fast signal recovery

  • US 8,504,154 B2
  • Filed: 03/30/2009
  • Issued: 08/06/2013
  • Est. Priority Date: 03/30/2009
  • Status: Active Grant
First Claim
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1. A physiological sense amplifier configured for use in a medical device to sense a physiological electrical signal of a patient comprising:

  • a high pass filter comprising a capacitor and a resistor coupled in series, wherein a voltage applied across the resistor is proportional to the physiological electrical signal;

    an amplifier that amplifies an input voltage to generate an output voltage, wherein the input voltage is a function of the voltage applied to the resistor when the input voltage is less than a predetermined threshold value; and

    a feedback network comprising a transistor coupled in parallel with the resistor,wherein the output voltage of the amplifier is coupled to a control terminal of the transistor to activate the transistor when the input voltage exceeds the predetermined threshold value, andwherein the transistor clamps the input voltage of the amplifier to a substantially constant value when the transistor is activated.

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