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Compensation circuit for an automotive ignition sensing system

  • US 6,392,315 B1
  • Filed: 04/05/1999
  • Issued: 05/21/2002
  • Est. Priority Date: 04/05/1999
  • Status: Expired due to Term
First Claim
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1. In a vehicle having an engine and an ignition system providing an ignition voltage signal to the engine, an ignition sensing circuit for providing a signal indicative of the ignition voltage to a device, the sensing circuit comprising:

  • an input for receiving the ignition voltage signal;

    an active filter element electrically connected between said input and a first output node, said filter element configured to filter the ignition voltage signal;

    an active compensation element electrically connected between said first output node and ground, wherein said compensation element is physically proximate said filter element and has substantially the same electrical performance characteristics as said filter element; and

    means for providing a compensated ignition voltage signal to the device by subtracting the voltage drop across said compensation element from the voltage at said first output node.

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