Phase Synchronous Loop Frequency Synthesizer and Fast Frequency Locking Method Using the Same

摘要

The present invention provides an AD converter for receiving a frequency control voltage for a voltage controlled oscillator for outputting a desired frequency in a frequency stable state, converting the frequency control voltage into a corresponding digital signal, and outputting the digital signal; A storage unit for storing a signal value of a; a DA converter for converting the signal value into a corresponding analog signal and outputting the analog signal; input of the frequency control voltage to the AD converter; A loop filter for applying the output voltage of the analog signal to the voltage controlled generator by a control unit which controls the reading of the signal value and the output of the analog signal from the DA converter and before the synthesizer is started PLL frequency synthesizer with high speed frequency using this synthesizer It relates to a large way.