VOLTAGE SETTING DEVICE, PLL SYNTHESIZER HAVING THE SAME DEVICE, SIGNAL ANALYSIS DEVICE, SIGNAL GENERATION DEVICE, AND VOLTAGE SETTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a voltage setting device capable of achieving operation stabilization and lock time reduction by performing more accurate pre-tuning.SOLUTION: The voltage setting device includes: an ADC 36 for measuring the voltage of an input signal; a DAC 31 for applying an output voltage via a first path to a VCO 13, and for applying the output voltage via a second path to an ADC 36; a first switch 33, a second switch 34 and a third switch 35 for switching the first path to the second path; and a DAC output adjustment part 39c for adjusting the output voltage of the DAC 31 such that the measurement value of the output voltage of the DAC 31 by the ADC 36 becomes a voltage predetermined for each frequency in a state that the path is switched to the first path. The DAC 31 applies the output voltage adjusted by the DAC output adjustment part 39c to the VCO 13 in accordance with the frequency in a state that the path is switched to the second path.SELECTED DRAWING: Figure 2