| 摘要 |
A phase compensation apparatus and method for a digital modulator which is suitable for maintaining the optimum operating state of the modulator provided in a digital television repeater by reducing the phase distortion produced from the modulator. The phase compensation apparatus includes a test signal generating circuit that generates test signals of a predetermined frequency, a modulator that modulates the test signals, a narrow band amplifying circuit that detects and filters a phase distortion signal included in an output signal of the modulator, a conversion circuit that converts a power level of the phase distortion signal filtered by the narrow band amplifying circuit to a digital value, a central processing unit that determines a phase compensation value for the modulator using the digital value converted by the conversion circuit, and a phase compensation circuit that compensates for a phase error produced in the modulator by pre-distorting input signals of the modulator using the phase compensation value determined by the central processing unit.
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