Patent ID: 8659343

Claim:
An integration circuit comprising: a. an input control switch configured to switch to a first position coupled to an input voltage signal and to a second position coupled to ground; b. an integrator coupled to an output of the input control switch, wherein the integrator is configured to output an integrated output voltage, wherein the integrator comprises: a resistive element coupled to the output of the input control switch; an amplifier coupled to an output of the resistive element; and an integrating feedback capacitor coupled to an input of the amplifier and to an output of the amplifier; c. a voltage adjustment circuit coupled to the integrator and comprising a charge dump capacitor, wherein the voltage adjustment circuit is configured to adjust the integrated output voltage by a voltage adjustment, wherein the value of the voltage adjustment is set by a capacitance ratio of the charge dump capacitor and the integrating feedback capacitor; and d. a logic circuit coupled to the voltage adjustment circuit and to the input control switch, wherein the logic circuit is configured to control the voltage adjustment circuit and the input control switch, further wherein when the input control switch is set to the first position the integrator integrates the input voltage signal and the voltage adjustment circuit adjusts the integrated output voltage by the voltage adjustment if the integrated output voltage reaches one or more defined limits, and when the input control switch is set to the second position the integrator, the voltage adjustment circuit, and the logic circuit are configured to perform a calibration process that measures a value of the adjustment value.