Magnetic head driving circuit with impedance elements to balance

Details Magnetic head driving circuit with impedance elements to balance Magnetic head driving circuit with impedance elements to balance

1992-06-19

1994-10-25

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 67, 360 68, 360 59, G11B 509, G11B 502

Patent

active

053594665

ABSTRACT:
In a magnetic head driving circuit, switching devices are turned on/off in response to a recording signal, thereby inverting a drive current to be applied from direct current power sources to a magnetic head coil. Switching devices to be switched in connection with on/off of the switching devices are connected in parallel with dummy loads connected to the direct current power sources in series. In response to the switching of the switching devices, the magnetic head coil and the dummy load alternately function as a load of each auxiliary coil. Impedances of the dummy loads are set to be equal to the impedance of the magnetic head coil, thereby making the total load of each of the auxiliary coils fixed at any time. Since a balance can be established between a value of a drive current in one direction and that of a drive current in the opposite direction, it is possible to reduce jitter of a recording mark and enable the drive current to suddenly rise and fall.

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