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High precision voltage source for electrical impedance tomography

  • US 7,701,227 B2
  • Filed: 12/30/2005
  • Issued: 04/20/2010
  • Est. Priority Date: 01/05/2005
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a plurality of voltage sources for supplying a corresponding plurality of voltages to a corresponding number of other structures;

    voltage source calibration means for calibrating each voltage source; and

    switching means for individually connecting the calibration means to each voltage source in succession during a period when each other structure is in an inactive condition;

    each voltage source including an operational amplifier having an output and a sense resistor connected to the output of the operational amplifier, each voltage source also including a buffer amplifier having an input connected to the sense resistor for outputting a measured voltage, and an instrumentation amplifier having one input connected to the operational amplifier output and another input connected to the sense resistor for outputting a measured current.

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