I and the Q channel which is the baseband component which crosses mutually from the operational mannered null reception signal of the clock reflex circuit

摘要

PROBLEM TO BE SOLVED: To provide a clock regeneration circuit which suppresses deterioration in quality of a received signal even if the distances from a quadrature demodulator to A/D converters which inputs via an I channel and a Q channel, two orthogonal baseband components, respectively, are different.;SOLUTION: A clock regeneration circuit is equipped with: a quadrature demodulator; two A/D converters; a phase detector; a low-pass filter; an oscillator; a C/N estimation circuit which calculates C/N estimated values for output signals of the two A/D converters and allows a phase error of the output signal of the A/D converter corresponding to a channel with a larger C/N estimated value from among the calculated two C/N estimated values be output as a phase error signal of the phase detector; and a phase adjustment circuit which adjusts the phase of the output signal of the A/D converter corresponding to a channel with a smaller C/N estimated value from among the C/N estimated values calculated by the C/N estimation circuit to make it identical to the phase of the output signal of the A/D converter corresponding to the channel with the larger C/N estimated value.;COPYRIGHT: (C)2010,JPO&INPIT