Calibration of fully-differential input system

A system for calibrating a fully-differential input system, comprising:

• a first input for receiving a first voltage of a first node of the fully-differential input system, wherein the first node is coupled at the first node to a plurality of first resistors in a first star configuration, and wherein the plurality of first resistors comprises:
• a first input resistor coupled between the first node and a first input of the amplifier system;
• a first common mode resistor coupled between the first node and a common mode voltage node of the amplifier system;
• and
• a first feedback resistor coupled between the first node and a first output node of the amplifier system;
• a second input for receiving a second voltage of a second node of the fully-differential input system, wherein the second node is coupled at the second node to a plurality of second resistors in a second star configuration, each resistor of the plurality of second resistors corresponding to a respective resistor of the plurality of first resistors, and wherein the plurality of second resistors comprises:
• a second input resistor corresponding to the first input resistor and coupled between the second node and a second input of the amplifier system;
• a second common mode resistor corresponding to the first common mode resistor and coupled between the second node and the common mode voltage node;
• a second feedback resistor corresponding to the first feedback resistor and coupled between the second node and a second output node of the amplifier system;
• and
• a calibration system configured to:
• trim a plurality of individual resistances of the plurality of first resistors and a plurality of individual resistances of the plurality of second resistors in order to maintain a difference of a first voltage at the first node and a second voltage at the second node at a constant level;
• trim one or both of the first input resistor and the second input resistor such that a first ratio of a resistance of the first feedback resistor to a resistance of the second feedback resistor is approximately equal to a second ratio of the first input resistor to a resistance of the second input resistor;
• and
• trim one or both of the first common mode resistor and the second common mode resistor such that the first ratio is approximately equal to a third ratio of the first common mode resistor to a resistance of the second common mode resistor.