Patent ID: 6908535
Filing Date: 2005-06-21
Classification: G01N

Abstract:
1. An integrated current-to-voltage conversion circuit for converting a first current to an output voltage representative of said first current, said circuit including first, second, and third contact pads, said first and second contact pads capable of being coupled to a first external resistor, said conversion circuit comprising: a first operational amplifier having a first input coupled to said third contact pad for producing a first voltage thereat, a second input for receiving a reference voltage, and a first output coupled to said first contact pad, a second voltage appearing at said first contact pad; a second operational amplifier having a second output, a first input coupled to said second output, and a second input coupled to said second contact pad, said second operational amplifier for generating a third voltage at said second output, said output voltage substantially equal to the difference between said second voltage and said third voltage; and a transfer gate coupled between said second contact pad and said third contact pad.