US 2006/0152838 A1 · Magneto-resistive head resistance sensor

Abstract

A recording system employing a magneto-resistive (MR) element senses a resistance value of the MR element and generates one or more MR resistance (MRR) signal values based on the sensed MR element resistance value. The MRR signal values might be, for example, current or voltage values proportional or inversely proportional to the MR element resistance value. The MRR signal values might be employed to control one or more of: i) a unity gain bandwidth of a bias loop for the MR element, ii) an MR read head preamplifier low corner frequency, and iii) a slew rate across the MR element.

Claims20

Dependent claims

An apparatus for generating at least one signal related to an impedance of a read element in a read channel of a read head, the apparatus comprising:

a first circuit, coupled across the read element, configured to provide a first signal of the read element;
a second circuit, coupled across a read head circuit portion including the read element, configured to provide a second signal of the recording head circuit portion;
and
a third circuit, coupled to the first and second circuits, configured to generate a combination of the first and second signals as the at least one signal related to the impedance of the read element.

1 more element

A read head for a read channel component of a recording system, the read head comprising:

a read element;
an amplifier coupled to the read element and adapted to amplify a voltage signal across the read element;
a bias circuit coupled to the read element and adapted to apply a biasing signal to the read element;
and
an impedance sensor coupled to the read element and adapted to sense the impedance of the read element and generate one or more control signals for controlling operations of at least one of the preamplifier and the bias circuit.

2 more elements

Dependencies are inferred from the claim text.

Magneto-resistive head resistance sensor

Life of this patent

Magneto-resistive head resistance sensor

Life of this patent

Abstract

Claims20