Reproducing circuit for a magnetic head

摘要

The present invention relates to a playback circuit for a magnetic head comprising an initial-stage amplifying means (22) for amplifying an output signal from a magneto-resistive head (1), a voltage-to-current converting amplifying means (51) for amplifying a differential signal between an output signal of said initial-stage amplifying means (22) and a reference voltage, a constant current source (25) connected to an output terminal of said voltage-to-current converting amplifying means (51), current amplifying means (53) for amplifying an output signal of said voltage-to-current converting amplifying means (51), a capacitor (26) connected to said current amplifying means (53), and feedback means for feeding back an output of said current amplifying means (53) to an input said of said initial-stage amplifying means (22)