Patent ID: 7218498

Claim:
An electronic sensor apparatus comprising: a first electrode; a second electrode; a signal source; and a control circuit, said control circuit comprising: an input section having a first input channel and a second input channel; a decision section having a first input, a second input, and an output; and an output section; said first input channel coupled to said signal source, to said first electrode, and to said first input of said decision section, said first input channel comprising at least one first input channel electrical component; said second input channel coupled to said signal source, to said second electrode, and to said second input of said decision section, said second input channel comprising at least one second input channel electrical component, each of said second input channel electrical components corresponding to one of said first input channel electrical components; and said output of said decision section coupled to said output section; wherein each of said second input channel electrical components is electrically matched to the corresponding first input channel electrical component.