A system includes an amplifier and a feedback network that includes a first resistance having one end that communicates with an input of the amplifier and an opposite end that communicates with an output of the amplifier. A first replica circuit provides a replica of a DC characteristic at the output of the amplifier. A second replica circuit provides a replica of a DC characteristic at the input of the amplifier. An input of a first buffer communicates with the first replica circuit, and an input of a second buffer communicates with the second replica circuit. A second resistance communicates with an output of the first buffer and an output of the second buffer. A first current source provides a first current at the input of the amplifier that is proportional to a second current flowing through the second resistance.