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:
Mar. 18, 2025
Filed:
May. 24, 2022
Applicant:
Airoha Technology Corp., Hsinchu, TW;
Inventors:
Heng-Chih Lin, Hsinchu, TW;
Shu-Yu Lin, New Taipei, TW;
Assignee:
Airoha Technology Corp., Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/089 (2006.01); H03L 7/091 (2006.01);
U.S. Cl.
CPC ...
H03L 7/0898 (2013.01); H03L 7/091 (2013.01);
Abstract
A charge pump of a phase-locked loop (PLL) circuit includes a current source circuit, a current sink circuit, and a biasing circuit. The biasing circuit includes a current digital-to-analog converter (IDAC) and a low-pass filter (LPF). The IDAC provides a reference current in response to a current value setting, wherein a first voltage is established due to the reference current. The LPF applies low-pass filtering to the first voltage to generate a filter output as a second voltage, wherein bias voltages of the current source circuit and the current sink circuit are controlled by the second voltage.