Patent ID: 7333408

Claim:
A demodulator for demodulating an input signal containing a first modulated signal and a second modulated signal, the demodulator comprising: a first internal reference wave generator for outputting a first internal reference wave corresponding to the first modulated signal; a first demodulation calculator for generating a demodulated signal of the first modulated signal through a calculation process on the first internal reference wave and the input signal; a first phase adjuster for adjusting a phase of the first internal reference wave outputted from the first internal reference wave generator; a second internal reference wave generator for outputting a second internal reference wave corresponding to the second modulated signal; a second demodulation calculator for generating a demodulated signal of the second modulated signal through a calculation process on the second internal reference wave and the input signal; and a second phase adjuster for determining an optimum phase of the second internal reference wave based on the demodulation results of the second demodulation calculator and adjusting a phase of the second internal reference wave outputted from the second internal reference wave generator, based on the value of the determined optimum phase, wherein the first phase adjuster adjusts the phase of the first internal reference wave outputted from the first internal reference generator, using the optimum phase value of the second phase adjuster.