US Patent No. 10,250,268

PLL CIRCUIT


Patent No. 10,250,268
Issue Date April 02, 2019
Title Pll Circuit
Inventorship Takeshi Endo, Saitama (JP)
Assignee NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)

Claim of US Patent No. 10,250,268

1. A PLL circuit, comprising:a voltage control oscillator that outputs an oscillation signal based on a control voltage;
a frequency difference detector that detects a frequency difference between a reference signal and the oscillation signal, the frequency difference detector outputting a first control value based on the frequency difference which is detected;
a phase difference detector that detects a phase difference between the reference signal and the oscillation signal, the phase difference detector outputting a second control value based on the phase difference which is detected; and
an outputter that outputs the control voltage, based on the first control value and the second control value, to the voltage control oscillator while the second control value does not exceed a predetermined range, the outputter outputting the control voltage, based on a corrected value obtained by correcting the first control value and the second control value, to the voltage control oscillator while the second control value exceeds a predetermined range.