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公开(公告)号：JP2002197602A
公开(公告)日：2002-07-12
申请号：JP2001332187
申请日：2001-10-30
Applicant: IBM
Inventor： BHAUMIK JAYDIP , KERTIS ROBERT ANDREW , KLAASSEN KLAAS BEREND , RAYMOND ALLAN RICHIETTA , VAN PEPPEN JACOBUS CORNELIS LE
Abstract: PROBLEM TO BE SOLVED: To provide a correction device for the magneto-resistance asymmetry and its method so that an asymmetric pulse from a magneto-resistance head is easily and efficiently corrected. SOLUTION: The device is provided with a shift circuit, 1st gain circuit, 2nd gain circuit and 3rd gain circuit. In the shift circuit, a shifted recording signal is produced by adding or dividing the shifted value with respect to a reading signal in accordance with the polarity of asymmetry. The reading signal, the shifted reading signal and the shifted value are produced by the shift circuit. The reading signal, the shifted reading signal and the shifted value are respectively received by the 1st, 2nd and 3rd gain circuits, and outputs amplified in accordance with each control signal are respectively produced. The reading signal is received by a control means to detect the polarity of the optional asymmetry of the reading signal, then a polarity signal is given to the shift circuit in accordance with the required correction amount, and also the respective control signals are given to the 1st, 2nd and 3rd gain circuits.
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公开(公告)号：JPH10233639A
公开(公告)日：1998-09-02
申请号：JP2476698
申请日：1998-02-05
Applicant: IBM
Inventor： GREGORY SCOTT WINN , RAYMOND ALLAN RICHIETTA
Abstract: PROBLEM TO BE SOLVED: To optimize the SNR of an input swing, and to minimize distortion over the entire range of an operation temperature by using a variable gain circuit controlled by the control signals of a temperature control circuit and controlling the signal swing of input signals so as to fluctuate along with temperature fluctuation within the effective linear signal range of an analog circuit. SOLUTION: Through the variable gain circuit 20 provided with an amplifier circuit for varying a gain in an optional range less than '1' and practically attenuating the input signals by being controlled by the control signals of the output of the temperature control circuit 40, the input signals are inputted to the analog circuit 30 of a bipolar differential amplifier provided with an input signal linearity limit for fluctuating along with the temperature. Then, the allowable swing of the input signals is limited, amplification is performed and the output signals 14 of the function of the input signals are outputted. Thus, the signal swing of the input signals is maintained at an almost fixed amount less than the maximum signal swing allowed by the analog circuit 30 at a given temperature, and even though a signal level is raised, noise is not increased corresponding to it.
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