Abstract: A track error detection device that removes a phase offset and a phase offset removing method thereof removes an error signal generated by device circuit errors. The device includes an equalizing unit for equalizing the inputted signals A, B, C and D at a level, a comparison unit for quantizing the equalized signals A, B, C and D, and a phase shifting unit for removing phase offsets among the quantized signals A, B, C and D, based on control signals. A system control unit provides the control signals to the phase shifting unit. The track error detection device can remove all types of phase offsets which occur in the track error detection device. The accuracy and reliability of the detected track error signal is thus improved. By adjusting the phases of the quantized signals in the process of removing the phase offsets, power consumption and size of hardware is reduced.

Abstract: A writable area detection device for an optical recording/reproducing apparatus comprises a waveform rectification unit for comparing an RF signal read from a user data area of a recording medium with a reference signal, and outputting a rectified pulse signal; a pulse generation unit for generating a signal having a pulse width including a section in which a high frequency signal of the rectified pulse signal is regularly distributed; a latch unit for latching the signal generated in the pulse generation unit; and a detection unit for detecting the section in which the high frequency signal is regularly distributed by using an output signal of the latch unit and an output signal of the pulse generation unit.

Abstract: A boosting circuit is disclosed. The boosting circuit includes an input circuit part for outputting a differential current proportional to input voltages; a bias circuit part for mirroring the differential current, and producing an inverted differential current that the differential current is inverted; and an output circuit part for adjusting magnitudes of the differential current and the inverted differential current based on a predetermined ratio of MOS transistors, respectively, adding the adjusted differential current and inverted differential current, and producing an output current in a push-pull form. Accordingly, the boosting circuit has a broad maximum differentiable frequency bandwidth, and facilitates the adjustments of differentiation characteristics of an output current. Further, an amount of output current of differentiation form is not affected by external factors such as voltages, processes, temperatures, and so on.

Abstract: A boosting circuit is disclosed. The boosting circuit includes an input circuit part for outputting a differential current proportional to input voltages; a bias circuit part for mirroring the differential current, and producing an inverted differential current that the differential current is inverted; and an output circuit part for adjusting magnitudes of the differential current and the inverted differential current based on a predetermined ratio of MOS transistors, respectively, adding the adjusted differential current and inverted differential current, and producing an output current in a push-pull form. Accordingly, the boosting circuit has a broad maximum differentiable frequency bandwidth, and facilitates the adjustments of differentiation characteristics of an output current. Further, an amount of output current of differentiation form is not affected by external factors such as voltages, processes, temperatures, and so on.

Abstract: A writable area detection device for an optical recording/reproducing apparatus comprises a waveform rectification unit for comparing an RF signal read from a user data area of a recording medium with a reference signal, and outputting a rectified pulse signal; a pulse generation unit for generating a signal having a pulse width including a section in which a high frequency signal of the rectified pulse signal is regularly distributed; a latch unit for latching the signal generated in the pulse generation unit; and a detection unit for detecting the section in which the high frequency signal is regularly distributed by using an output signal of the latch unit and an output signal of the pulse generation unit.

Abstract: A track error detection device that removes a phase offset and a phase offset removing method thereof removes an error signal generated by device circuit errors. The device includes an equalizing unit for equalizing the inputted signals A, B, C and D at a level, a comparison unit for quantizing the equalized signals A, B, C and D, and a phase shifting unit for removing phase offsets among the quantized signals A, B, C and D, based on control signals. A system control unit provides the control signals to the phase shifting unit. The track error detection device can remove all types of phase offsets which occur in the track error detection device. The accuracy and reliability of the detected track error signal is thus improved. By adjusting the phases of the quantized signals in the process of removing the phase offsets, power consumption and size of hardware is reduced.