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:
Oct. 08, 2019
Filed:
Nov. 13, 2018
National Chiao Tung University, Hsinchu, TW;
Shih-Hsing Wang, Hsinchu, TW;
Chung-Chih Hung, Tainan County, TW;
National Chiao Tung University, Hsinchu, TW;
Abstract
A two-step switching method of circuit switch can be used in a charge pump circuit of a phase locked loop circuit. In the method, a first type switch and a second type switch which have the same sizes and are opposite in type, are provided. The first type switch and second type switch continuously receive an input current, and the input current is kept at a low current state in a first stage before the first type switch and the second type switch are turned on. In a second stage, the first type switch and the second type switch are turned on, the input current is gradually adjusted to a target current state, and the input current of the target current state is gradually supplied to an external circuit. The present method can reduce noise generated by the external circuit, reduce power loss, and offset charge injection.