Patent ID: 7359136
Filing Date: 2008-04-15
Classification: G11B,H03F

Abstract:
1. An amplifier system with feedback current cancellation comprising: an amplifier with an input, an output, and at least one stage; a feedback network that includes a first resistance having one end that communicates with the input of the amplifier and an opposite end that communicates with the output of the amplifier; first and second unity-gain buffers, each having an input and an output, wherein the input of the first buffer communicates with the output of the amplifier, and the input of the second buffer communicates with the input of the amplifier; a second resistance that has one end that communicates with the output of the first buffer, and an opposite end that communicates with the output of the second buffer; and a first current mirror that provides a first current at the input of the amplifier that is proportional to a second current flowing through the second resistance.