Patent ID: 7751140
Filing Date: 2010-07-06
Classification: G11B,H03F

Abstract:
1. A system comprising: an amplifier; 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 that provides a replica of a DC characteristic at the output of the amplifier; a second replica circuit that provides a replica of a DC characteristic at the input of the amplifier; first and second buffers, wherein an input of the first buffer communicates with the first replica circuit, and an input of the second buffer communicates with the second replica circuit; a second resistance that communicates with an output of the first buffer and an output of the second buffer; and a first current source that provides a first current at the input of the amplifier that is proportional to a second current flowing through the second resistance.