| 摘要 |
PURPOSE:To obtain securely a normal read pulse signal corresponding to a readout signal by detecting the peak of the readout signal securely even when the readout signal inputted from a magnetic head contains a bias voltage component. CONSTITUTION:A clamping circuit 30 is equipped with resistances R2 and R3 connected in series and a voltage divided by those resistances R2 and R3 is applied to anodes of diodes D1 and D2. Then, the cathode side of the diode D1 is connected to the base of a transistor (TR)15 and one terminal of a capacitor C. Further, the cathode side of the diode D2 is connected to the base of a TR16 and the other terminal of the capacitor C. Consequently, even when the readout signal containing the bias voltage component is inputted, the readout signal is clamped to a specific voltage level as long as it is higher than a reference voltage VR, and the peak of the readout signal is detected securely by a peak detecting circuit 10. |
