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High sensitivity single or multi sensor interface circuit with constant voltage operation

  • US 7,301,352 B1
  • Filed: 06/27/2006
  • Issued: 11/27/2007
  • Est. Priority Date: 11/07/2005
  • Status: Expired due to Fees
First Claim
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1. A sensor circuit having a first Part, the first Part comprising:

  • an operational amplifier equipped withan inverting input,a non-inverting input, andan output,a plurality of resistance-based sensors electrically connected to one another in a parallel configuration having first and second sides across which a voltage can be applied wherein the voltage so-applied will be identical across each of the sensors,the first side of the parallel configuration connected to a connecting junction,andthe second side of the parallel configuration connected to a ground terminal,a feedback resistor connected between the operational amplifier output and the connecting junction,a variable voltage source and a first series resistor connected in series between the ground terminal and the connecting junction wherein a voltage at the output of the operational amplifier can be adjusted to zero by adjusting the voltage output of the variable voltage source,anda constant voltage source witha constant voltage source first end connected to the non-inverting input of the operational amplifier, anda constant voltage source second end connected to the ground terminal.

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