Patent ID: 8929012
Filing Date: 2015-01-06
Classification: G11B

Abstract:
1. A system for low noise amplification in the presence of a voltage offset, comprising: a first amplifier configured to receive an input signal from a first terminal of a magnetoresistive head; a second amplifier configured to receive an input signal from a second terminal of the magnetoresistive head; biasing circuitry configured to bias the first amplifier and the second amplifier according to a detected input voltage offset; a first feedback resistor configured to receive an input signal from the first terminal of the magnetoresistive head, the biasing circuitry being configured to detect the input voltage offset for the first amplifier via the first feedback resistor; and a second feedback resistor configured to receive an input signal from the second terminal of the magnetoresistive head, the biasing circuitry being configured to detect the input voltage offset for the second amplifier via the second feedback resistor.