Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1992-10-09
1994-03-22
Hajec, Donald
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 61, 360 68, G11B 509, G11B 1512, G11B 502
Patent
active
052969754
ABSTRACT:
Writing of data on a storage disk by an inductive magnetic transducer is modulated by write driver circuitry that includes a supply voltage as low as three volts provided by a source referenced to ground, and a bias current source connected to either the supply voltage source or ground. Two bias control switches respectively direct the bias current to one or the other of two current gain circuits according to whether a positive or a negative input terminal has a preselected polarity. The gain circuits selectively respond to the bias currents supplied by the associated control switch for amplifying the bias current to remove a write current from a respective associated terminal of the transducer. Two current source switches connected to a respective one of the input terminals and to a respective one of the terminals of the transducer selectively allow and prevent the write current from flowing into the respective associated terminal of the transducer depending upon which of the input terminals has the preselected polarity. When data is not being written by the transducer, a controllable reference voltage circuit maintains the transducer at a potential at least as negative as ground to prevent electro-erosion of the transducer; and this circuit also is preferably connected to both gain circuits to prevent them from saturating.
REFERENCES:
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IBM Technical Disclosure Bulletin, vol. 23, Apr. 1981, pp. 5167-5168.
Contreras John T.
Jove Stephen A.
Klassen Klaas B.
Leonardus van Peppen Jacobus C.
Hajec Donald
International Business Machines - Corporation
Le Thien Minh
Otto, Jr. Henry E.
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