TH51161B - Magneto Resistive Asymmetry Correction Circuit - Google Patents

Abstract

DC60 (09/01/45) Electrical circuit arrangement for correcting the asymmetry of the magnetoresistive head, including a sliding circuit which receives the readings from the magnetoresistive head and signaling. In the polar state of any asymmetry of the reading signal Depending on the polarity of the asymmetry conditions, the sliding circuit increases or decreases. The one Pressure shifted to a reading signal to produce a scrolled reading signal. A sliding circuit will give a signal output. Read signal, shifted reading signal, and shifted pressure The first, second and third gain circuits are provided that receive a read signal, a shifted reading signal, and a shifted voltage respectively, and each of which receives an individual control signal. The first, second and third gain circuits provide a proportional amplified output signal. Depending on the individual control signals, the control circuits provide polar condition signals to the slide circuit and each control signal to the first, second and third gain circuits depending on the amount of rectification. Need a common mode feedback circuit to be adjusted for replacement. Converting in conventional mode caused by waveforming, an electrical circuit arrangement for correcting the asymmetry of the magnetoresistive head, as well as a sliding circuit which receives the readings from the magnetoresistive head. And indication of the signal in the polar state of the polar state of any asymmetry of the reading signal. Depending on the polarity of the asymmetry conditions, the sliding circuit increases or decreases. The one Pressure shifted to a reading signal to produce a scrolled reading signal. A sliding circuit will give a signal output. Read signal, shifted reading signal, and shifted pressure The first, second and third amplifiers are provided, which receive a read signal, a shifted reading signal, and a shifted voltage respectively, and each of which receives an individual control signal. The first, second and third gain circuits provide a proportional amplified output signal. Depending on the individual control signals, the control circuits provide polar condition signals to the slide circuit and each control signal to the first, second and third gain circuits depending on the amount of rectification. Need a common mode feedback circuit to be adjusted for replacement. Converting in the conventional mode is generated by making a waveform.

Claims (9)

1. The arrangement for correcting the asymmetry of the magnetoresistive head consists of: a sliding circuit which receives the readings of the magnetoresistive head and the signal indication in Polarity of any asymmetric reading signal polarity; Where, depending on the polarity of asymmetry, the shift circuit will either add or subtract either the shift value to the reading signal to produce the shifted reading signal; Where the scroll circuit outputs a reading signal, a scrolled reading signal, and a shift value; And the first, second and third amplifiers which receive read signals, shifted reading signals, and their respective shift values, and each circuit receiving a controlled signal, where the first, at The second and third provide each amplified output according to each control signal. 2. The arrangement according to claim 1, where each control signal And signal condition with polarity It is obtained from the read signal by the control path, the control path that receives the read signal, that detects the polar condition of any asymmetry of the reading signal and which provides the signal. Polarized condition to sliding circuit And each control signal To the first, second and third amplifiers depending on the amount of rectification required. 3. The arrangement under claim 1 also consists of Simple mode modulation path for the output signal. The first, second and third amplifiers, respectively, are like combined output. And for correcting the effect of any common mode in the combined output 4. The arrangement according to claim 3 where normal mode modulation methods Contains a feeder circuit Back to normal mode 5. The arrangement according to claim 3 also consists of a pair of emitter follower. For receiving signals from the first, second and third amplifiers each and providing a combined output to the modulation path of the common mode. 6.Arrangement according to claim 1, where each control signal and polar condition signal is derived from a reading signal. By the control path, the control path receives the read signal, detects the polar state of any asymmetry of the reading signal, and provides the polar condition signal. To the sliding circuit And control signals to the first, second and third amplifiers each, depending on the amount of rectification required; Where the control path consists of: detection path For receiving reading signals, detecting any asymmetry in the received reading signal. And the polar condition of any asymmetry, produces a polar condition signal. And produce digital correction signal pointing. Of the amount of correction The desired asymmetry; And a converter from digital to analog For receiving digital correction signals and producing individual control signals To the first, second and third amplifiers depending on the amount of rectification required. 7. Methods of correcting asymmetry The magneto-resistive reading signal consists of the use of the arrangement in claim 1. 8. Arrangement according to claim 1, where the first, second and third amplifiers consist of a differential amplifier pair. Characteristic Allowing electricity to pass through one Which can be changed by adding electric current to one side of the differential pair. 9. Arrangement according to claim 8, where the first, second and third amplifiers consist of a bipolar differential transistor pair 1. 0.Methods of correcting asymmetry In the magneto-resistive reading signal, it consists of utilizing the arrangement in accordance with claim 2 to be beneficial 1. 1. Methods of correcting asymmetry In the magneto-resistive reading signal, it consists of utilizing the arrangement in accordance with claim 3 1. 2. Methods of correcting asymmetry In the magneto-resistive reading signal, it consists of utilizing the arrangement in accordance with claim 6 to be beneficial 1. 3. Methods of correcting asymmetry in magneto resistive head reading signal, consisting of: detecting the amount of asymmetry in the reading signal, and polar condition of Detectable asymmetry; And producing corrected reading signals By combining the output of the first, second and third gain stages, the first, second, and third gain stages. Where is a linear gain step which receives the unchanged reading signal. Second gain step Where it is a nonlinear gain step which accepts a reading signal changed by a shift in polarity of the non Symmetric detectable And the third gain step that takes the promoted value Gain step with rate Enlarge each one that is controlled Based on detectable asymmetry 1 4. In the reading channel of the magnetoresistive head, the arrangement for correcting any asymmetry in the reading signal includes: For detecting any asymmetry in signal readings and polarized conditions; And the corrective pathway for correcting any detectable asymmetry of the step reading signal is with the detecting path 1. 5. Arrangement according to claim 14, where the remedial path consists of: polarity switch And the sliding control circuit path Which receives the reading and control signals asymmetry of the polarized condition From the detection method And which gives a read signal output, a shifted reading signal And scrolling signal; The first, second and third gain paths are received as an input signal. Reading signal, shifted reading signal, and shift signal respectively from polarity condition switch. And cycle path Control scroll And each path receives a separate gain control signal, which adjusts the amount of amplification used. To produce each output signal; And the way together For receiving signals out of each first, second and third gain path, combine each output into a combined signal and adjust the effect of any common mode on the combined output1. 6. Arrangement according to claim 15, where the remedy also includes converters from Digital to analog For receiving digital signals By pointing out the detecting pathway of the amount of asymmetry in the reading signal. And for providing a gain control signal to the trajectory The first, second and third gain, each of which depend on the received digital signal 1. 7. Arrangement according to claim 14, where the magneto resistive head reading signal consists of; Magneto resistive head; A pre-amp that is connected to receive the read signal from the head and output the read signal to the pre-amp; Amplifier with variable gain That is connected to receive a pre-amp signal and output an amplified reading signal; Asymmetry correction circuit Including the detection method And ways to fix it Connected together to receive the amplified read signal. And give the signal out Revised reading signal; Lo-pass filter Connected To receive the modified read signal and output the filtered read signal; And a converter from analog to digital Connected To receive filtered read signals And give the signal out Digital signal agent 1 8. Arrangement according to Proposition 15, where the first, second and third gain paths are made up of ampilflyer differential pairs. That has the characteristics of allowing electricity to pass Which can be transformed by adding electric current to one side of the differential pair 1. 9. Arrangement according to claim 18, where the first, second and third gain circuits are made up of bipolar 2 differential pairs. 0.Methods of correcting asymmetry In the signal of reading From the magnetoresistive head consists of the use of the arrangement in accordance with claim 14.