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Linearization of a sensing bridge circuit output

  • US 5,122,756 A
  • Filed: 11/28/1989
  • Issued: 06/16/1992
  • Est. Priority Date: 11/28/1989
  • Status: Expired due to Term
First Claim
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1. A linearization circuit for a mass air flow sensor, comprising:

  • an upstream thermally sensitive resistor;

    a heat source;

    a downstream thermally sensitive resistor, said heat source being disposed between said upstream and downstream thermally sensitive resistors;

    a first reference resistor connected electrically in series with said upstream resistor between a first circuit point and a ground potential to form a first current path;

    a second reference resistor connected electrically in series with said downstream resistor between said first circuit point and said ground potential to form a second current path, said first and second current paths being connected in electrically parallel association;

    an amplifier having first and second inputs, said first input being connected in electrical communication with a first junction between said first reference resistor and said upstream thermally sensitive resistor, said second input being connected in electrical communication with a second junction between said second reference resistor and said downstream thermally sensitive resistor, said amplifier having an output;

    means for adding an offset voltage to an amplification of a voltage difference between said first and second junctions to provide an amplified and offset signal at said output of said amplifier; and

    means for connecting said output of said amplifier in electrical communication with said first circuit point, said output of said amplifier being generally linear.

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