A method and a system for direct and polar modulation using a two-input PLL(Phase Locked Loop) are provided to transmit properly an input data signal by using an adaptive control method. A method for processing a signal within a circuit includes a process for controlling a two-input analog PLL(Phase Locked Loop) during a direct modulation period or a polar modulation period by using a digital method. The method further includes a process for compensating a low frequency passing characteristic of the two-input analog PLL(306) through a digital filter. The digital filter is a parametric equalizer. The method further includes a process for generating a first digital signal and a second digital signal from an analog feedback signal generated by the two-input analog PLL.
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