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:
May. 31, 2022
Filed:
Jan. 16, 2019
United Microelectronics Corp., Hsinchu, TW;
Kun-Yuan Wu, Kaohsiung, TW;
Wei-Jen Wang, Tainan, TW;
Chien-Fu Chen, Miaoli County, TW;
Chen-Hsien Hsu, Hsinchu County, TW;
Yuan-Hui Chen, Hsinchu, TW;
Ruei-Yau Chen, Pingtung County, TW;
Cheng-Tsung Ku, Taichung, TW;
Zhi-Hong Huang, Tainan, TW;
Cheng-Yang Tsai, Kaohsiung, TW;
Yu-Lin Chen, Taichung, TW;
UNITED MICROELECTRONICS CORP., Hsinchu, TW;
Abstract
The invention provides a testkey detection circuit, including a plurality of oscillators and a driving circuit. Each of the oscillators has an enable terminal, a voltage terminal and an output terminal, wherein the enable terminals are connected to a common enable terminal. The driving circuit receives the output terminals of the oscillators and increases a driving level of a selected one of the output terminals as a frequency output.