| 摘要 |
A head amplifier which inputs signals reproduced from a head. Its technical problem is to prevent the occurence of offset in the head amplifier and to prevent distortion in the reproduced signals while decreasing the number of externally provided parts and the number of pins when the device is realized in the form of an IC.For this purpose, the head amplifier is comprised of amplifier means for amplifying the reproduced signals, differential amplifier means for receiving the output of the amplifier means and a reference voltage, and means for comparing the output of said amplifier means with a reference voltage, and wherein the output of the comparator means is fed back to said amplifier means in order to eliminate the offset between the two inputs of the differential amplifier means. |
