Patent ID: 7414476

Claim:
An adjustable sensor interface, comprising: a first operational amplifier comprising a first inverting input, a first non-inverting input, and a first output; first gain circuitry comprising an input coupled to said first output of said operational amplifier, said first gain circuitry also comprising an output; a first gain stage comprising a gain stage input coupled to said first output of said operational amplifier, an output, and a first gain stage switch configured to have a closed state and an open state, said first gain stage being electrically coupled to said first gain circuitry; a first resistor having a first end coupled to said output of said first gain circuitry, said resistor further having a second end coupled to said output of said first gain stage and said inverting input of said first operational amplifier; and control circuitry coupled to said first gain stage and configured to control a state of said first gain stage switch, wherein said first gain circuitry is configured to provide a first feedback current at said second end of said first resistor when said first gain stage switch is in an open state, and wherein said first gain stage and said first gain circuitry are each configured to provide a feedback current having an approximately equal magnitude at said second end of said first resistor when said first gain stage switch is in a closed state, and wherein a gain of said first operational amplifier is varied based on the state of said first gain stage switch.