Patent ID: 8183916

Claim:
A non-inverting amplifier, comprising: an operational amplifier that amplifies and outputs a difference between an input voltage and a voltage of a control node; an input resistor connected between a reference voltage port and the control node; a feedback resistor connected to an output port of the operational amplifier and the control node, and a current digital-to-analog converter for supplying a control current to the control node, wherein the non-inverting amplifier supplies the control current to the control node for controlling an offset voltage of the output port, wherein the current digital-to-analog converter comprises a plurality of current sources connectable in parallel, wherein each of the current sources is configured to supply a current to the control node when a switching operation connects a respective current source to the control node, wherein each of the current sources are connected in series to a respective switch such that the switching operation controls each of respective switches to supply a desired control current, and wherein the switching operation controls each of the respective switches according to a decoded digital value.