Patent ID: 7233452
Filing Date: 2007-06-19
Classification: G11B,H03F

Abstract:
1. A preamplifier circuit of a magnetic record regeneration apparatus with a write system which sends write currents corresponding to write data to a magnetic head performing writing and readout of data into and from a recording medium and a read system which receives readout currents of the magnetic head, comprising, in the write system: a write driver; a current-voltage conversion circuit for converting the write current from the write driver into a corresponding voltage; a waveform shaping circuit for converting the output voltage from the current-voltage conversion circuit into a full-wave rectified waveform; a peak-hold circuit for holding a peak value of the output from the waveform shaping circuit; a filter circuit for outputting an average voltage of the output from the waveform shaping circuit; and a determination circuit for determining that the write driver is abnormal based on each output status of the peak-hold circuit and the filter circuit.