US 12,283,963 B2
Phase locked loop and sensing device
Tetsuro Itakura, Nerima Tokyo (JP); Ryunosuke Gando, Yokohama Kanagawa (JP); Daiki Ono, Yokohama Kanagawa (JP); and Akihide Sai, Yokohama Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Sep. 9, 2022, as Appl. No. 17/930,767.
Claims priority of application No. 2021-172484 (JP), filed on Oct. 21, 2021.
Prior Publication US 2023/0125664 A1, Apr. 27, 2023
Int. Cl. H03L 7/099 (2006.01); G01C 19/567 (2012.01); H03L 7/085 (2006.01)
CPC H03L 7/0991 (2013.01) [G01C 19/567 (2013.01); H03L 7/085 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A phase locked loop comprising:
an oscillator that varies a frequency according to a control signal;
a resonance element that resonates at a predetermined resonance frequency and output a signal obtained by shifting a phase of an output signal of the oscillator by 90 degrees at the resonance frequency;
a phase detector that detects a phase error between an output signal of the resonance element and an output signal of the oscillator;
a feedback controller that controls a frequency of an output signal of the oscillator by proportional control and integral control according to the phase error; and
a control signal corrector that corrects the control signal by adding a correction term corresponding to environment information to an output signal of the feedback controller.