Wide-band modulation pll, timing error correction system of wide-band modulation pll, modulation timing error correction method and method for adjusting radio communication apparatus having wide-band modulation pll

A timing correcting system for a broadband modulation PLL, comprising:

• a broadband modulation PLL;
• a measuring portion for demodulating an output signal of the broadband modulation PLL and detecting a value indicating modulation precision;
• and
• a measuring unit for demodulating an output signal of the PLL portion and calculating an amplitude value, wherein the broadband modulation PLL comprises a PLL portion containing a voltage controlled oscillator, a frequency divider for dividing the frequency of an output signal of the voltage controlled oscillator, a phase comparator for comparing the output of the frequency-divider with a reference signal, and a loop filter for averaging the output of the phase comparator, a firs modulation input portion for inputting a first modulation signal to a first position of the PLL portion, a second modulation input portion for inputting a second modulation signal to a second position different from the first position of the PLL portion on the basis of the modulation data, an operating portion for calculating a timing error on the basis of the amplitude value measured by the measuring unit, and a storage portion for storing a timing set value for controlling the output time of at least one of the first modulation input portion and the second modulation input portion which is calculated on the basis of the timing error, thereby adjusting a modulation timing, the first modulation input portion and the second modulation input portion being controlled so that the timing error is corrected on the basis of the timing set value set in the storage portion.

A timing error correcting method in broadband modulation PLL comprising:

• a step of inputting to different two points in PLL modulation data which are opposite to each other in phase;
• a step of adding modulation signals based on the modulation data;
• a step of detecting the timing error between the respective modulation signals on the basis of the added modulation signals;
• and
• a step of correcting an output timing of at least one of the two-point modulations input to the PLL on the basis of the detected timing error.