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:
Nov. 18, 2025
Filed:
Mar. 07, 2024
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Takeji Fujibayashi, Tokyo, JP;
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Abstract
A PLL circuit including a digitally controlled oscillator outputting, as an output signal, a signal having a frequency modulated according to a control signal, a detection unit detecting a difference in at least one of a ratio or a phase of a frequency between the output signal and a reference signal, a digital loop filter smoothing an output indicating the difference output from the detection unit and outputs, as the control signal, a resulting output to the digitally controlled oscillator, a control signal storage unit storing, as a previous control signal, a digital value based on the control signal output from the digital loop filter in a predetermined period immediately before end of a chirp operation period, and a control unit controlling the digital loop filter such that the control signal output from the digital loop filter immediately after start of the chirp operation period is the previous control signal.