The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 2025
Filed:
Dec. 27, 2022
Seiko Epson Corporation, Tokyo, JP;
Masayoshi Todorokihara, Suwa, JP;
SEIKO EPSON CORPORATION, , JP;
Abstract
A frequency synthesizer includes: a time-to-digital converter configured to output a time-to-digital value corresponding to a time event of a trigger signal with respect to an operating clock signal; a comparison unit configured to compare a value based on the time-to-digital value with a target value; an oscillation unit configured to generate the synthesizer signal; and a frequency adjustment unit configured to adjust a frequency of the synthesizer signal based on a comparison result of the comparison unit. The time-to-digital converter includes: a state transition unit configured to start a state transition in which an internal state transitions based on the time event of the trigger signal and output state information indicating the internal state; a transition state acquisition unit configured to acquire and hold the state information in synchronization with the operating clock signal; and a calculation unit configured to calculate the time-to-digital value according to the number of transition times of the internal state based on the state information acquired by the transition state acquisition unit.